Biofuels

This article deals with ‘Biofuels – UPSC.’ This is part of our series on ‘Environment’, an important pillar of the GS-3 syllabus. For more articles on Science and technology, you can click here.


  • Biofuels are renewable fuels made from biomass — organic materials such as plants, crop waste, used oils, animal waste, or industrial biowaste. Unlike fossil fuels like coal and petroleum, biofuels are cleaner and sustainable, releasing much fewer pollutants when burnt.
Biofuels
  • The two most common types of biofuels in use today are:
    • Ethanol (used with petrol)
    • Biodiesel (used with diesel)

Biofuels are categorized into four generations depending on the type of raw materials used and technology applied:

1GBiofuels are produced from food crops (leading to the Food vs. Fuel debate).
E.g., Ethanol produced from feedstock of sugarcane, cereals (rice, wheat, barley, corn & sorghum), sugar beet, etc.
2GBiofuels are produced from crop residues and non-food biomass (e.g., rice straw, wheat husk, bagasse) (it addresses food vs fuel debate, but the process is net carbon positive)
– E.g., Ethanol produced from crop residues like wheat husk, rice straw
3G– Biofuels are produced from Algae. They absorb CO₂ while growing and are net carbon neutral.
– E.g., Ethanol produced from Microalgae.
4G– Biofuels are produced from Genetically Modified Organisms.
– Aim is to make the process net carbon negative and create artificial carbon sinks.

  • Ethanol (Ethyl Alcohol) is 99.9% pure alcohol.
  • It is manufactured from sugarcane, maize, and other sources with light starch content.
  • It is blended with petrol to reduce fossil fuel use and emissions.
  • The most common blend is E10 (10% ethanol + 90% petrol). India is aiming for E20 soon.

There are two main sources:

  1. Sugarcane Juice / Molasses: Easier and cheaper to convert into ethanol.
  2. Cereals like maize, rice, wheat: First require conversion of starch to sugar, hence more expensive and complex.

Benefits of Ethanol
  • Cuts fuel import bills — India can save ₹30,000 crore per year
  • Reduces carbon emissions and air pollution
  • Helps farmers by creating demand for sugarcane and waste crops
  • Creates employment and supports rural economy
  • Enhances energy security and reduces dependence on fossil fuels

Ethanol Blending Program (EBP)

  • Launched: 2003
  • The target is to achieve:
    • 10% blending by 2022 (achieved)
    • 20% blending by 2025-26 (earlier 2030

National Biofuel Policy, 2018

  • Promotes ethanol production from diverse feedstocks, including sugarcane, maize, surplus rice, and damaged grains, with the aim of achieving 10% blending by 2022 and 20% blending by 2025-26.

Dr Rakesh Sarwal Committee Recommendations

  • Dr. Rakesh Sarwal’s committee was formed to suggest a roadmap for ethanol blending in India from 2020-2025.
  • It gave the following recommendations
    1. Start using E10, i.e blending 10% Ethanol in Petrol from 2022.
    2. Start using E20, i.e. blending 20% Ethanol in Petrol from 2025.
    3. Invest in R&D for E20 compliant engines.
    4. Provide tax subsidies to purchase E20-compliant vehicles.
    5. The ultimate goal is  E100  (i.e.  Running a vehicle completely on ethanol,  without petrol) in the future.

Other Measures

  • Budget 2022: ₹2/litre excise duty on unblended petrol
  • GST on ethanol reduced to 5%
  • PM-JIVAN Yojana: Viability gap funding for 2G bio-refineries

  • Competing demands: Ethanol is also used in alcohol, pharma, and other industries
  • Water Stress: Sugarcane is a water-guzzling crop, and its production for producing Ethanol can cause irreparable damage to the water tables. 
  • Cyclic sugar industry: Sugar industry is cyclic in nature due to availability of cane.
  •  Food security: Diverting food grains for ethanol can impact food availability

Biodiesel is a type of biofuel made from natural, renewable sources like vegetable oils, animal fats, or even used cooking oil. Unlike traditional diesel, which is made from crude oil (a fossil fuel), biodiesel is biodegradable, non-toxic, and produces much less pollution.


  • Reduces Greenhouse Gas Emissions: Biodiesel produces up to 75% less carbon dioxide compared to regular diesel. 
  • Cleaner Air: It emits less particulate matter, sulphur, and carbon monoxide, improving air quality.
  • Can Be Used in Existing Engines: Biodiesel can be blended with regular diesel (e.g., B20 = 20% biodiesel + 80% diesel), requiring no major engine modifications.
  • Promotes Waste Management: Used cooking oil, which otherwise pollutes drains and soil, can be converted into biodiesel.
  • Supports Farmers: Raw materials for biodiesel like soybean, mustard, jatropha etc., can be grown by farmers — boosting rural incomes.

  • Food vs Fuel Debate: Using edible oils (like soybean or palm oil) for fuel can reduce food availability.
  • Limited Infrastructure: India still lacks large-scale facilities to produce and distribute biodiesel.
  • Seasonal Availability: Crop-based raw material supply is seasonal and dependent on monsoons.

  • India launched the Biofuel Policy 2018, aiming to blend 5% biodiesel in diesel by 2030.
  • Focus on non-edible oil plants like Jatropha, grown on wastelands, is encouraged to avoid competition with food crops.

  • Jatropha is a drought-resistant shrub that has gained attention in recent years for its potential as a biofuel crop, especially in countries like India.
  • Its seeds contain up to 30–40% oil, which can be converted into biodiesel
  • It is a hardy, non-edible plant that grows well on wastelands and marginal lands

  • Launched at the G20 Summit (held in India in 2023)
  • Led by India, the USA, and Brazil
  • Launched with nine initiating members–India, the US, Brazil, Argentina, Bangladesh, Italy, Mauritius, South Africa, and the United Arab Emirates. Now includes 29 countries & 14 international organisations
  • Aim: Promote global trade, cooperation, and sustainable use of biofuels

The search for alternatives to fossil fuels has brought biofuels into global focus due to their renewable nature and potential to reduce greenhouse gas emissions. However, the question remains: Can biofuels truly replace fossil fuels in a sustainable, equitable, and scalable manner?


  1. Renewable and Cleaner: Biofuels like bioethanol and biodiesel are derived from organic materials and are biodegradable and reduce net carbon emissions, especially in the case of sugarcane-based ethanol
  2. Energy Security: Biofuels offer countries like India a chance to reduce dependency on imported oil, thus improving energy security and supporting rural economic development through energy crop cultivation.
  3. Use of Waste Biomass (2nd Generation Biofuels): These involve converting agricultural waste like stalks, husks, and bagasse into biofuel, offering a sustainable solution without compromising food security.

  1. Food vs Fuel Dilemma (1st Gen Biofuels): Using food crops like sugarcane, corn, and rice for fuel diverts resources away from food, worsening hunger and disproportionately impacting low- and middle-income populations, especially women and children.
  2. Ecological Damage:
    • Deforestation for energy crop cultivation (e.g., in the Amazon) disrupts ecosystems.
    • Monoculture practices reduce biodiversity.
    • Water-intensive crops strain freshwater supplies in already water-scarce regions.
  3. Socioeconomic Impact: Biofuel expansion has led to the displacement of indigenous communities and worsened climate variability in some regions.

While biofuels have a role to play in reducing fossil fuel use, they cannot fully replace fossil fuels without addressing serious challenges related to food security, ecology, emissions, and social justice. Thus, biofuels should be part of a broader energy transition strategy that includes solar, wind, hydrogen, and energy efficiency measures.

Climate Change Frameworks  – Kyoto Protocol and Paris Climate Deal

This article deals with ‘Climate Change Frameworks  – Kyoto Protocol and Paris Climate Deal – UPSC.’ This is part of our series on ‘Environment’, an important pillar of the GS-3 syllabus. For more articles on Science and technology, you can click here.


Stand 1: India wants developed countries to reduce their carbon space for developing countries to grow. For example, India’s per capita carbon emissions are one-third of the global average. Hence, developed countries should reduce their carbon emissions so that developing countries can grow. 


Stand 2: Since India’s contribution to the world’s cumulative emissions is less than 4%, it should be provided a greater share of the remaining carbon budget. Simultaneously, developed countries should strive towards sustainable consumption, acknowledging their historical consumption of carbon budget. 


Climate Change Frameworks  - Kyoto Protocol and Paris Climate Deal

UNFCCC is an inter-governmental treaty that opened for signature at the ‘Rio Earth Summit’ in 1992 and entered into force in 1994.

Objectives of UNFCCC

  1. Stabilize the GHG concentration in the atmosphere to prevent dangerous anthropogenic interference with climate systems.
  2. Ensure global food production is not threatened.
  3. Enable sustainable economic development.

Operating Mechanism of UNFCCC

  1. Conference of Parties (COP): All the countries that are parties to the convention meet every year at the Conference of Parties, which acts as the supreme decision-making body of the convention.
  2. Conference of the Parties serving as the meeting of the Parties to the Kyoto Protocol (CMP): It oversees the implementation of the Kyoto Protocol.
  3. Conference of the Parties serving as the meeting of the Parties to the Paris Agreement(CMA): It oversees the implementation of the Paris Agreement. 

  • The Kyoto Protocol is an international treaty established as a result of the 3rd Conference of the Parties (CoP) to the United Nations Framework Convention on Climate Change (UNFCCC) held in Kyoto, Japan, in 1997
  • Its primary objective is to address the issue of global warming by setting specific targets for industrialized nations to reduce their greenhouse gas (GHG) emissions.
  • The protocol sets a target for industrialized countries to collectively reduce their GHG emissions by approximately 5.2% below the levels recorded in 1990.
  • Kyoto Protocol came into force after the required number of Annex 1 Countries (industrialized nations) ratified it. This milestone was achieved in 2008.
  • The Kyoto Protocol’s first commitment period was from 2008 to 2012. 

  • CBDR suggests that while all nations share the common responsibility to reduce GHG emissions, there should be a distinction in the burden between developed and developing countries.
  • Developed nations, being historical culprits, bear a greater responsibility for emission reduction.
  • The Kyoto Protocol follows this principle.

Annex refers to additional information provided at the end of a book or treaty.

Annex under Kyoto Protocol
Annex A Gases under Kyoto Protocol

Side Topic: More about GHGs

GasGlobal Warming PotentialLifetime yrsRelative Contribution to Global Warming
CO2150-20060%
CH4211220%
Nitrous oxide3101206%
HFCs140-12001-27014%
PFCs6500-9200800-50,000Rank 5
SF623,9003200Rank 6

  • Under the Kyoto Protocol, every Annex 1 country was given a specific number of Kyoto Units called Target Quota. E.g. in 2009, Australia was given approximately 3 Billion Kyoto units (1 Kyoto Unit= 1 ton of CO2) 
  • If Australia limits their emissions within the target range, everything is well & good. The approach of the Australian government should be to take all steps so that they don’t cross the quota. E.g.
    • They can promote Solar energy and wind energy. 
    • Increase tax on polluting vehicles and industry.
    • Make strict Anti-pollution laws. 
  • But if the country fails to limit GHG emissions within Target Quota, then the country will have to buy additional units from another country. Kyoto Protocol has 3 mechanisms for this.
How the Kyoto Protocol really works
  • Each Annex 1 country gives a fixed quota to companies. 
    • Suppose an Iron factory was given 10 tons of GHG. 
    • Tyre company was also given 10 tons of GHG.
  • If the tyre company owner increases the efficiency and uses less than given Kyoto Units, he will have some spare quota. Suppose the Iron Company owner needs more Quotas due to an increase in demand or any other factor. In this case, the Iron company owner can purchase the spare quota of the Tyre company. It is called Emission trading.
  • Countries in Annex 1 can also do the same thing at national level if they think that they are breaching the limits.
Emission Trading
  • Suppose an Annex 1 country like the UK is given a quota of 500 units but emits 520 units of GHG. In this case, the UK can finance a solar or wind project in India or any other non-annex country. They will get a certificate that it led to a reduction of 20 units of GHG to remain within their limit.
  • Companies in Annex 1 country can also do the same thing if that company is breaching their limit. 
  • JI operates similarly to CDM but involves Annex 1 countries conducting emission reduction projects in other Annex 1 countries.
  • In this context, the UK could initiate a beneficial project in another Annex 1 country, such as Australia, to offset excess emissions and earn certified emission reduction credits.

1992Earth Summit was held in Rio de Janeiro, and UNFCCC came into being.
1997Kyoto Protocol signed, setting emission reduction targets for Annex 1 countries.
2008The Kyoto Protocol came into force, but the US, the largest polluter at the time, did not ratify it (alleging that it would impact its economic interests negatively since China and India were not obliged to reduce their emissions)
2009The Copenhagen Accord was signed at CoP-15, held in Copenhagen, where it was agreed that all countries (including developing countries) should pledge to reduce GHG emissions. However, all of the pledges made under the Copenhagen Accord were voluntary.
2011Canada becomes the first country to quit the Kyoto Protocol, arguing its flaws and the exclusion of major emitters like the USA and China.
2015COP21 in Paris delivers the Paris Agreement as successor to the Kyoto Protocol.
4 Nov 2016Paris agreement entered into force, 30 days after being ratified by at least 55 countries representing 55% of global greenhouse gas emissions.

The Kyoto Protocol, established in 1997, marked the initial step in creating a framework for binding emission reduction commitments primarily for developed nations. However, it faced significant challenges, including the absence of major emitters like the United States and China.

The limitations of the Kyoto Protocol underscored the need for a more inclusive and flexible approach that could garner global participation. The Paris Climate Agreement, adopted in 2015 during the 21st Conference of the Parties (COP21), emerged as the successor to the Kyoto Protocol.


Limit Global Warming

  • Under the Paris Climate Agreement, 196 nations pledged to collaborate in efforts to restrict global warming, aiming to cap temperature increases at 2 degrees Celsius, with a stretch goal of keeping below 1.5 C (Compromise between Developed nations demanding 2 degrees & Small Island nations demanding 1.5 degrees Celsius).

Emission Cuts

  • Emission Cuts: There is no distinction between Developed & Developing nations wrt emission cuts. Every nation has to cut emissions based on its capability, known as its Nationally Determined Contributions. But there are no penalties for failing to achieve these targets
  • Global Stocktake (Pledge Review):  ‘Global Stocktake’ is a ‘five-yearly review’ of a country’s climate change actions. The first global stocktake happened in 2023.
  • Principle of Progression: Revised targets (after a period of 5 years) can’t be less than targets already submitted. At each round of review, there is an expectation of higher ambitions. 

Finance 

  • Financial Commitment: Developed countries pledged to provide $100 billion annually from 2020 to address climate change issues. Developed countries have succeeded in inserting a provision asking developing countries to also raise financial resources, even as a voluntary effort.
  • Balanced Allocation: Allocation of finances has to be balanced between the mitigation & adaptation needs of developing countries

Regarding Concept of Common But Differentiated Responsibility

  • CBDR Diluted: There is no differentiation between developed and developing nations regarding emission reductions, although distinctions remain in terms of finance and capacity building. Each nation is required to reduce emissions based on its capabilities, indicating a dilution of the CBDR principle. Although CBDR still figures, historical responsibility finds no mention in the text. 

  • Intended Nationally Determined Contribution (INDC) is each country’s self-declared plan to cut greenhouse gas (GHG) emissions and adapt to climate change. It follows a bottom-up approach, shaped by national circumstances and capacity, aiming collectively to limit warming to 1.5–2°C above pre-industrial levels.
  • NDCs are submitted before ratifying the Paris Agreement; once ratified, they become NDCs (Nationally Determined Contributions) and are legally binding under international law.
  • They are applied equally to both developed and developing countries when ratified.

UNFCCC Ratcheting Mechanism

  • NDCs must be submitted and updated every 5 years, as per the Paris Agreement’s ratchet mechanism
  • In line with this, countries were urged to strengthen their 2030 targets by 2022. India responded by submitting its updated NDC in August 2022

India’s NDC

Drawing inspiration from Gandhi—”Earth provides enough for everyone’s need, not for everyone’s greed”—India’s climate targets have grown more ambitious:

CommitmentOriginal INDC 2015Updated NDC 2022
Emission Intensity33–35% reduction (2005–2030)45% reduction (2005–2030)
Non-fossil Energy Share40% of power capacity50% of installed capacity by 2030
Carbon Sink2.5–3 billion t CO₂ eqSame

Additional qualitative commitments include promoting sustainable lifestyles, climate resilience in vulnerable sectors, and financing mechanisms.

As of July 2025, more than 50% of India’s electricity generation capacity comes from non-fossil fuel sources. Hence, India has achieved commitment #2 five years ahead of schedule.


  • Commitments are voluntary, lack penalties for non-compliance, and set no clear trajectory for limiting global warming below 2 degrees Celsius.
  • The Paris Deal is not legally binding in its entirety, diminishing its effectiveness in ensuring adherence to commitments.
  • The commitments of rich countries are not enough to meet their historical obligations. US comes in for particular blame (26-28% than 2005 levels) 
  • The Paris Agreement calls for decarbonization but doesn’t distinguish between fossil carbon and dynamic forest carbon. Fossil carbon is generally static, whereas trees & forest carbon, which is in an active carbon pool (atmosphere & biosphere), can be easily released through activities such as forest fires 
  • The promise of contributing $100 bn annually to the Green Climate Fund by developed countries is enormously short of what is needed.

  • The European Union (EU) realized a problem: its domestic industries had to follow strict carbon emission rules under the Emissions Trading System (ETS). But imported goods—say, steel from India or cement from China—are not held to the same standards. This created what’s called “carbon leakage”: industries moved production to countries with looser rules to escape EU climate costs.
Carbon Border Adjustment Mechanism (CBAM)
  • To address this issue, the EU introduced CBAM
    • It proposes a carbon tax on imports of carbon-intensive goods like steel, cement, aluminium, fertilisers, and electricity starting from 2026.
    • Importers in the EU will have to equal to the amount of carbon emissions embedded in the goods they bring in. If the product has already been taxed for carbon in the country of origin, that amount will be deducted.
    • The main idea is to ensure that foreign manufacturers do not get an unfair advantage over EU companies.
  • The EU argues this levels the playing field.
  • Concerns of Developing Countries like India:
    • Violates “Common But Differentiated Responsibilities” under the Paris Agreement.
    • Seen as a trade barrier that hurts exports from developing nations.
    • Unilateral in nature – introduced without global consensus.

  • The Global Stocktake (GST) is a formal process under the Paris Agreement to assess whether the world is on track to meet its climate goals, especially the goal of limiting global warming to well below 2°C, preferably 1.5°C.
  • It was agreed in the Paris Agreement (2015) that such a review would take place every 5 years, with the first-ever stocktake conducted in 2023 during the COP28 in UAE.
  • The process looks at the collective progress of all countries (not individual country performance) and aims to inform future Nationally Determined Contributions (NDCs).

Key Highlights of the 2023 Global Stocktake

  • The report confirmed that the world is currently off track to meet the Paris climate targets.
  • To limit warming to 1.5°C, global greenhouse gas (GHG) emissions must be reduced by 43% by 2030, compared to 2019 levels.

COP / EventYear & LocationMajor Outcomes / Highlights
COP21 (Paris)2015, ParisParis Agreement adopted — goal to limit warming to well below 2°C, pursue 1.5°C; NDCs introduced; universal participation.
COP22 (Marrakesh)2016, MoroccoMarrakech Action Proclamation to implement Paris Agreement; established “Marrakech Partnership” for climate action.
COP23 (Bonn)2017, Germany (Fiji presided)Fiji-led COP; advancement on rulebook development; focus on vulnerable countries and adaptation.
COP24 (Katowice)2018, PolandKatowice Climate Package adopted — detailed rulebook for Paris Agreement operationalisation; transparency guidelines agreed.
COP25 (Madrid)2019, SpainDelayed decisions on carbon markets (Article 6); calls for increased ambition; discussions on loss & damage finance.
COVID-19 Pandemic Impact2020COP26 postponed to 2021; many countries re-assessed climate ambitions.
COP26 (Glasgow)2021, UKGlasgow Climate Pact: phase down coal, boost finance to developing countries, methane reduction pledge, Article 6 carbon market rules agreed.
U.S. Rejoins Paris Agreement2021U.S. formally rejoins Paris Agreement, submitting updated NDC with higher targets.
COP27 (Sharm El-Sheikh)2022, EgyptEstablished loss and damage fund for vulnerable countries; focus on adaptation finance; continued dialogue on mitigation.
COP28 (Dubai)2023First Global Stocktake to assess collective progress; called for urgent action to close gaps in emissions reductions.
COP29 (Baku)2024, AzerbaijanNew Collective Quantified Goal (NCQG) on climate finance: mobilize $1.3 trillion/year by 2035, immediate $300B/year commitment.
Operationalization of Article 6.4 carbon market mechanism under UN oversight.
Loss & Damage Fund operationalized.
Launch of “Baku Dialogue on Water for Climate Action.”

Mercury Poisoning

Mercury Poisoning

This article deals with ‘Mercury Poisoning  – UPSC.’ This is part of our series on ‘Environment’, which is an important pillar of the GS-3 syllabus. For more articles on Science and technology, you can click here.


Introduction

Mercury concentrates as highly toxic Methyl Mercury in the bodies of fish.

Mercury Poisoning

Minamata disease

  • The disease was searched in Japan’s seaside town of Minamata.
  • Strange behaviour was seen in cats, birds & also in humans. The investigation found that petrochemical companies had been discharging mercury waste into the sea.
  • Around 5,000 people were killed & 50,000 were poisoned to some extent by Mercury.
Minamata disease

Humans have controlled the Minamata disease and the use of Mercury to a large extent. But such cases are sporadically noticed in 

  • Mercury Mining, mainly in China
  • Central Asian nations like Kyrgyzstan 
  • In India 
    1. Kodaikanal (Tamil Nadu): The thermometer factory was dumping waste (the factory was of Ponds and later acquired by Hindustan Unilever in 1987 ) 
    1. Singrauli Region in Uttar Pradesh 
    2. Ganjam in Odisha 

Applications of Mercury

Applications of Mercury

Side Topic: Diseases from Metal Poisoning

Mercury Minamata Disease
Cadmium Itai Itai
Nitrate Blue Baby Syndrome
Water with little or no fluoride Cavity in teeth
Arsenic Black Foot Disease (disfigures the skin, impacts kidney and, heart & lung fatalities.

Minamata Convention on Mercury

  • Minamata Convention aims to control the use of Mercury.
  • The convention was signed in Kumamoto (Japan) in 2013 and ratified by India in 2014.
  • Minamata Convention is part of the cluster of agreements, including 
    • Basel Convention to control transboundary movement of hazardous wastes
    • Rotterdam Convention to manage international trade of hazardous chemicals and pesticides
    • Stockholm Convention to restrict and eliminate persistent organic pollutants.

What does India have to do?

  • India will have to establish and enforce mercury emission standards for coal-fired power plants(and coal mining).  
  • The Chlor-alkali industry has to use mercury-free technologies.
  • Replace CFLs with LED.

Noise Pollution in India

Noise Pollution in India

Last Update: March 2023

This article deals with ‘Noise Pollution in India – UPSC.’ This is part of our series on ‘Environment’, an important pillar of the GS-3 syllabus. For more articles on Science and technology, you can click here.


Introduction

Noise Pollution in India
  • The unwanted and undesirable sound or sound that can disrupt one’s quality of life is called noise.
  • Noise pollution is the phrase used to describe when there is excessive “noise” in the environment.
  • World Health Organization has prescribed optimum noise level as 45 dB by day and 35 dB by night. Anything above 80 dB is hazardous.

Sources of Noise Pollution

Sources of Noise Pollution
  • Industrialization (industries use big machines)   
  • Poor Urban Planning: Congested houses and large families sharing small space
  • Social Events:  Such as marriage, parties, pubs or places of worship 
  • Vehicles: A large number of vehicles run and honk on roads
  • Construction Activities  
  • Household appliances like noise from the TV, Radio, Air Conditioner, cooking appliances etc. These might be minor contributors but affect the quality of life badly.

India suffers from high levels of Noise pollution. For example, World Health Organisation’s “Worldwide Hearing Index” reported that Delhi is the second-worst city with the highest noise pollution (Guangzhou in China is the worst and Zurich in Switzerland is the best). 


Effects of Prolonged Noise Pollution

  • Physical Effects: It leads to irreversible Noise-Induced Hearing Loss (NIHL), heart disease, high blood pressure, stress-related illness, sleep disruption and productivity loss. 
  • Physiological effects: 
    • Depression and fatigue 
    • Aggressive behaviour 
    • Straining of senses and annoyance 
    • Psychomotor impacts
  • Sleeping disorders: Loud noise can impact a person’s sleeping cycle. Due to this, a person’s performance may go down in the office.
  • Effect on Wildlife: Wildlife is dependent on sounds for their various functions, and animals may become easy prey.

Legal and Constitutional Provisions 

  • Article 48-A regarding protection and improvement of the environment) 
  • Article 51-A (fundamental duties) of the Constitution of India.
  • Air (Prevention and Control of Pollution) Act, 1981: The act includes noise in the definition of ‘air pollutant’.
  • Noise Pollution (Regulation & Control) Rules: Under the rules, permissible noise limits are as follows
    1. Industrial Areas: 75 decibels during the day and 70 decibels during the night
    2. Commercial Areas: 65 decibels during the day and 55 decibels during the night
    3. Residential Areas: 55 decibels during the day and 45 decibels during the night
  • The Central Pollution Control Board (CPCB) has set up the National Ambient Noise Monitoring Network (NANMN), covering 35 locations in seven metro cities like Delhi, Lucknow, Hyderabad, Kolkata, Mumbai, Chennai and Bangalore.
  • Article 48-A, i.e. protection and improvement of the environment
  • Article 51-A, i.e. fundamental duties of the Constitution of India
  • Central Pollution Control Board (CPCB) has established the National Ambient Noise Monitoring Network (NANMN), covering 35 locations in seven metro cities like Delhi, Lucknow, Hyderabad, Kolkata, Mumbai, Chennai and Bangalore.


Preventive measures

  • Personal Level: NIHL can be prevented by  
    • Dietary supplements rich in antioxidants  
    • Use of earplugs  
  • Scientific urban planning: Transport terminals, Industries, airports, and railway terminals sight should be far from living spaces.
  • Green Belt, i.e. planting trees in and around noise sources.
  • Lubricating the industrial machinery to reduce their noise levels
  • Making and implementing laws in effective ways to control noise pollution. E.g., regulations regarding loudspeakers are present but not applied strictly.

Ways to Control Climate Change

Ways to Control Climate Change

This article deals with ‘Ways to Control Climate Change – UPSC.’ This is part of our series on ‘Environment’, an important pillar of the GS-3 syllabus. For more articles on Science and technology, you can click here.


Introduction

  • It is a deliberate, large-scale intervention carried out in Earth’s natural systems to reverse the impacts of climate change.
  • It involves techniques to physically manipulate the global climate to cool the planet.
  • These techniques fall primarily under three categories:
    • Carbon Capture, Utilisation and Storage (CCUS)
    • Climate Engineering
    • Other Projects (Carbfix Project, Controlling the Emissions of Ruminants, etc.) 


1. Carbon Capture, Utilisation and Storage (CCUS)

It is the process of removing carbon from the atmosphere & depositing it in a reservoir. 

First Capture CO2  

  • Firstly, we need to capture the CO2 directly from the atmosphere or at the end of combustion & industrial processes. 
  • It is done using technologies such as
    1. Chemical Solvent: Preferred when dealing with gas streams that are lean in CO2 and have relatively lower pressures, such as flue gas streams from power plants etc. 
    2. Adsorption: Suitable for gas streams with moderate to high pressure and moderate CO2 concentration, such as steam methane reforming (SMR) flue gas.
    3. Cryogenic Separation: Preferred in cases where the cost of power is low.

Transport and then store CO2 in Reservoir (Carbon Sequestration) 

The captured CO2  is then stored in reservoirs, which can include

  • Depleted Oil and Gas Reserves 
  • Unmineable Coal Seams
  • Deep Saline Aquifers 
  • Enhancing the productivity of ocean biosystems through fertilization, e.g. algae 
  • Inject CO2 into the deep ocean  
  • Enhancing and manipulating the forests, wetlands etc.
  • Artificial Upwelling: This water will absorb more CO2 
  • Ocean fertilization 
Ways to Control Climate Change

Issues with the Concept

  • There is general agreement about the need to halt fossil fuel emissions, particularly in industrialized countries. However, instead of moving ahead with drastic reductions in energy use and initiating a transition towards low-carbon economies, forests’ ability to (temporarily) sink carbon is being used to justify continued fossil fuel use.
  • Afforestation – especially afforestation in northern tundra regions – may accelerate global Warming. Dark green forests absorb more sunlight than tundra or farmland, adding to the warming trend (snow reflects).
  • All carbon is not the same. Fossil carbon is generally static, whereas that which is in the active carbon pool (the atmosphere and the biosphere) can be easily released through activities beyond government control, such as forest fires).
  • Lands dedicated to carbon sink projects require contractual agreements that lock the land up for years, often decades.  
  • High Cost: Upfront capital investment for carbon capture technology, transport pipelines, and geological storage is high, and significant energy and water usage is required to capture and compress CO2.
  • Insufficient geological information: Due to a lack of geological survey technology, companies lack geological information before the project is carried out. Therefore, they cannot accurately predict project risks.

2. Climate Engineering

  • Climate engineering describes a diverse and largely hypothetical array of technologies and techniques for intentionally manipulating the global climate to moderate or forestall the (most severe) effects of climate change.
  • These include
    1. Space Mirrors: Reflect Solar Energy and not allowing it to enter the atmosphere
    2. Reflective Aerosols in Stratosphere (proponents claim that it can reduce Global Warming by 1 C) 
    3. Cloud Seeding: Clouds are good reflectors of sunlight
    4. Using pale-coloured roofing material or growing high albedo crops
    5. Cirrus cloud manipulation: Cirrus clouds are removed or thinned so that their long-wave trapping capacity is reduced, thus cooling the surface.
    6. Diamond Dust: Spraying the diamond dust in the upper atmosphere as diamond dust is a good reflector of sunlight.


3. Other Projects for Carbon Fixation going on

3.1 Carbfix Project

  • It is a project in Iceland that aims to lock away CO2 by reacting it with basaltic rocks. 
  • Carbonated water is injected into the rocks to react with Calcium, Magnesium or Silicate material present in Basaltic rocks. It is called enhanced weathering. Thus, the CO2 is captured permanently without releasing any harmful by-products. 

3.2 Controlling the Emissions of Ruminants

Emissions of Ruminants

Philanthropists such as Bill Gates are funding startups to develop feed called Rumin8 that will reduce the amount of methane they emit in the atmosphere.

Denmark has decided to impose tax on its livestock farmers for the greenhouse gases (GHGs) emitted by their cows, sheep, and pigs from 2030.

Impacts of Climate Change

Impacts of Climate Change

This article deals with ‘Impacts of Climate Change  – UPSC.’ This is part of our series on ‘Environment’, an important pillar of the GS-3 syllabus. For more articles on Science and technology, you can click here.


Introduction

The Climate Change we will talk about in this article pertains to the change in the climate because of human-induced factors.

Even before humans, the Earth’s climate has changed throughout history. In the last 6.5 lakh years, Earth has passed through 7 ice ages. The last ice age ended approx. 7000 years ago, also marking the beginning of human civilization.

But the climate change that we are witnessing now is entirely different. The earlier changes were primarily attributed to minor variations in the Earth’s orbit, which changed the amount of solar insolation received by Earth’s atmosphere or volcanic eruptions.

The reason for the present climate change is the increase in the concentration of heat-trapping gases (or Green House Gases) in the Earth’s atmosphere due to the increase in the rate of burning of fossil fuels.

Mauna Loa Atmospheric Baseline Observatory (Hawaii) has been recording the CO2 concentration since 1958. The concentration reached dangerous levels of 415 ppm in 2019 and 420 ppm in 2023.

Impacts of Climate Change

Many people, especially from countries like the USA, UK etc., known as Climate Sceptics, don’t accept that Global Warming and Climate Change are real. After fighting for years against denialism, scientists have now been successful in making world leaders realize that we need to act against climate change if we want to avoid the potentially huge cost to the economy and society worldwide caused by the “irreversible build-up of greenhouse gases (GHGs) and warming of the globe.”


Evidences and Impacts of Climate Change

1. Glacier Retreats

  • Glaciers have been melting rapidly due to global warming, leading to a phenomenon known as Glacier Retreat. The examples include Hindukush – Karakoram – Himalayan Glacier Retreat and Kaskawulsh Glacier Retreat (Kaskawulsh is Canada’s one of the largest glacier).
  • The breakdown of Larsen C Glacier (in the Antarctic) is the result of Climate Change and Global Warming.

Impact of Glacier Retreat

  • Shortage of Water: The glacier retreat can result in a water shortage in the river streams fed by the glaciers. Therefore, it will negatively impact the lives of people living in those river basins.
  • River Piracy: Climate Change has resulted in the retreat of one of Canada’s largest glaciers (Kaskawulsh Glacier). It led to an incident called ‘River Piracy’ by the researchers.
    • Earlier (Before Retreat): The glacier was feeding Slims River (taking water to the Bering Sea) 
    • Now (After Retreat): The glacier feeds Alsek River (taking water to the Gulf of Alaska)
  • Habitat Loss: Animals that dwell on or near glaciers may be pushed towards extinction—for example, tiny ice worms. 
  • Contaminants: Persistent Organic Pollutants (POPs) such as PCBs (Polychlorinated Biphenyls) are transported in the air from their source to cooler areas where they condense and are deposited in glacial ice. Rapid melting has begun to release them back into the environment. For example, in some Canadian lakes, glacial meltwater is the source of 50-97% of the various POPs entering the lake. 
  • Flooding: Rapid melting of glaciers can lead to flooding in rivers.  
  • Sea Level Rise: Sea-level rise will affect coastal regions worldwide, causing erosion and saltwater intrusion into aquifers and freshwater habitats. 

2. Climate Change and Oceans

Climate Change and global warming have impacted the oceans negatively in various ways.

  • As CO2 concentration in the atmosphere has increased, more CO2 is being dissolved in Ocean Waters, leading to the formation of Carbonic Acid. It increases the pH of Ocean Water (i.e. makes it acidic), which harms the calcifying animals.

  • According to the IPCC Report, the world’s oceans have absorbed 90% of the temperature rise caused by man-made GHG emissions.
  • Ocean warming creates anoxic (i.e., waters with no dissolved oxygen) and hypoxic (i.e. waters with low oxygen concentration) zones. It leads to the destruction of the ecosystem in those zones.

  • Sea Level rise happens due to two reasons
    • Glaciers melting at a faster pace
    • The density of warm water is lower (leading to higher volume)
  • Impact of Sea Level Rise is as follows
    • Large-Scale Displacement: 10% of the world’s population lives on the coast, which faces the danger of getting displaced. Additionally, many islands will disappear (like Kiribati, Maldives, Tuvalu, etc.)
    • The saltwater intrusion into surface waters will exacerbate the issue of drinking water shortage. 
    • Increasingly severe storm surges will cause damage to property situated on coasts. 
    • International Conflicts: Sea Level Rise will change nations’ exclusive economic zones, potentially creating conflicts between neighbouring nations. 

  • Oceans are now receiving more fresh water due to climate change. It is changing the patterns of Ocean Currents, thus resulting in strange weather phenomena. E.g., increase in the frequency of tropical cyclones and El-Nino.
  • It is disrupting the marine food chains. 

  • Rainfall Patterns Affected: Precipitation patterns in a number of areas have changed, resulting from large-scale atmospheric teleconnections with ocean warming.   
  • Due to Ocean Warming, more rain happens over the ocean and rainfall on land decreases. It impacts agriculture negatively.
  • Due to Ocean Warming, the size of fish is decreasing. The experiment showed that fish raised in warm waters weighed less and had lower metabolic performance than those raised in lower temperatures.

  • Ocean warming leads to deoxygenation, i.e., reduced dissolved oxygen in ocean water. It negatively impacts the marine species, ecosystems and fundamental benefits humans derive from the ocean.

  • Ocean Warming is leading to the migration of tropical marine creatures towards temperate areas, thus disturbing the food chain, food availability and biodiversity of a region. 

3. Climate Change and Island Submergence

  • Island states such as Tuvalu, Mauritius etc., are on the verge of submergence.
  • Kiribati  is on the verge of drowning and will become the first country to drown due to sea level rise due to climate change
  • A World Bank report stated that some of these states, including the Marshall Islands and Tuvalu, may lose their status as a nation if sea levels continue to rise at this rate.


4. Increase in frequency of Extreme Events 

  • As per the Sixth Assessment Report (AR6) of the Intergovernmental Panel on Climate Change (IPCC), human-induced climate change has likely increased the frequency and intensity of extreme events since pre-industrial times, including heatwaves, extreme precipitation events, marine heatwaves, etc.
  • For example, since 2020, we have seen a large number of extreme events like
    • Heatwave in Canada and parts of the USA. Temperatures in Canada have reached as high as 49.4 °C.
    • Floods in Germany, New South Wales (Australia),  Pakistan (2022) and India (2023).
    • Forest Fires in Canada and Europe (2022, 2023 and 2024) and Bushfires in Australia (2020).
Increase in frequency of Extreme Events due to Climate Change

5. Impact on Flora and Fauna

  • Rapid climate change is more than the ability of animals to adjust. In 1999, the death of the last Golden Toad in Central America marked the first documented species extinction driven by climate change. Experts opine that one-fourth of Earth’s species will face extinction by 2050 due to climate change.
  • Animal and plant species are responding to earlier springs—E.g, earlier frog breeding, bird nesting, flowering, and migration of birds and butterflies.
  • Increased Frequency of Wildfires: As the Earth gets warmer and droughts increase, wildfires are expected to occur more often and be more destructive. Wildfires do occur naturally, but the extremely dry conditions resulting from droughts allow fires to start more easily, spread faster, and burn longer.
  • The distribution of tree lines, plants, birds, mammals, insects, fish, reptiles, and marine invertebrates is shifting towards the poles. 
  • The distribution of plants is shifting to higher elevations.
  • Tropical reef corals are expanding poleward.


6. Impact on Health

  • Global Warming has led to greater frequency & severity of heat waves. In 2003, for example, extreme heat waves caused more than 20,000 deaths in Europe and more than 1,500 deaths in India.
  • Malaria is now being reported from countries like Bhutan for the first time.
  • Climate Change has increased the spread of infectious diseases, mainly because warmer temperatures allow disease-carrying insects, animals and microbes to survive in areas where they were once blocked by cold weather.
  • According to the Lancet Report, Climate Change will lead to undernutrition and obesity.  
    • Undernutrition: Global Warming will lead to lower yields, thus resulting in undernutrition. 
    • Obesity: Climate Change will reduce the production of fruits & vegetables, making them expensive and forcing people to move towards processed food (high in fats, sugars, and sodium).


7. Impact on Security

Climate Change is leading to environmental degradation, food shortages, and unfair distribution of resources, likely leading to tension and conflict. The civil war in Syria has had successive droughts as one of the most important issues.

Climate Change is a security issue because

  • Local Resource Competition: Due to Climate Change, pressure on local resources like water is increasing, leading to instability and violent conflict. Transboundary river water issues will become violent due to water shortage.
  • Forced Migrations: World Bank Report points toward the fact that by 2050, 140 million people from South Asia & Latin America will be forced to migrate due to climate change.
  • Volatile food prices heighten the risk of protest, rioting and civil conflict.
  • Sea level rise and coastal degradation will lead to social disruption and disagreement over maritime boundaries (change in EEZ) and ocean resources. 

Keeping this in mind, United Nations Security Council deliberated on the impacts of climate-related disasters on international peace and security.


8. Impact on Women

Women are impacted by climate change disproportionately.

  1. Patriarchal norms: Socio-cultural factors like regulations on movement, childcare and elderly care responsibilities, gendered cultural codes of dress etc., limit their mobility and heighten vulnerability and exposure to climate change-related extreme weather events. 
  2. Dependence on natural resources: Women increasingly rely on natural resources for their livelihood, which is threatened by climate change. E.g., 75.7% of women in rural India are engaged in agriculture (PLFS, 2019-20).
  3. Public measures lack a gender equality perspective: Most policy documents lack explicit provisions for addressing the specific vulnerabilities of women across sectors.
  4. Inadequate access to and control over finance and productive resources: It affects women’s contribution to climate efforts and ability to recover from climate-related disasters or loss of livelihood economically. 
  5. Lack of gendered data: The scale and scope of women’s burden related to climate change are not well understood due to inadequate data. 

9. Impact on Health

  • Global Warming will lead to greater frequency & severity of heat waves and extreme weather events. In 2003, for example, extreme heat waves caused more than 20,000 deaths in Europe and more than 1,500 deaths in India.
  • Malaria is now being reported from countries like Bhutan for the first time.
  • In 2023, Crimean-Congo Haemorrhagic Fever (CCHF) endemic to Africa started to spread in Europe.
  • Climate Change increases the spread of infectious diseases, mainly because warmer temperatures allow disease-carrying insects, animals and microbes to survive in areas once blocked by cold weather.
  • Climate Change will lead to undernutrition and obesity (Lancet Report) as
    • Global Warming will lead to lower yields. 
    • Global Warming might reduce protein and other micronutrients in plants. 
    • Climate Change will reduce the production of fruits & vegetables, making them expensive and forcing people to move towards processed food, which is high in fats, sugars, and sodium.


  • Increased Insurance Cost: Extreme weather events influenced by climate change are causing ever greater destruction, forcing insurers to increase their premiums. The major insurance company has stopped selling insurance policies in California, citing the growing risk of catastrophes, steep construction costs and a challenging reinsurance market.


  • Definition: People forced to migrate due to climate-induced disasters like rising sea levels, droughts, or floods.
  • The issue has become more important because Nations like Kiribati, Tuvalu, Maldives face existential threats due to rising sea levels and their citizens may lose homes without refugee rights or legal resettlement options.
  • Legal Gap:
    • The 1951 Refugee Convention does not recognize environmental reasons as grounds for refugee status. For Example: In 2015, New Zealand rejected asylum to Ioane Teitiota from Kiribati, citing the absence of “persecution” required under the Refugee Convention.
Climate Refugees

Side Topic: Anthropocene Epoch

For the last 12,000 years, we’ve lived in the Holocene Epoch — a stable period where all human civilizations flourished. But something changed after 1950s — humans began to reshape the Earth like never before.

How Humans Changed the Planet:

  • We triggered mass extinction — 75% of species may vanish in coming centuries.
  • Our fertilizers doubled nitrogen & phosphorus levels in soils.
  • We left permanent pollution traces in sediments and glaciers.

Scientists Take Notice

  • In 2000, Nobel Laureate Paul Crutzen coined the term Anthropocene — meaning “age of humans.”
  • In 2016, experts at the World Geological Congress suggested officially declaring it a new epoch.
  • By 2019, a global panel voted in favour (29-4) of calling it the Anthropocene Epoch.

Concept of Climate Change

Concept of Climate Change

This article deals with ‘Concept of Climate Change  – UPSC.’ This is part of our series on ‘Environment’, an important pillar of the GS-3 syllabus. For more articles on Science and technology, you can click here.


What is Climate?

  • Climate is often described as average weather 
  • The classical period is 30 years. 

What is Climate Change?

  • Climate Change is the periodic modification of the usual weather of a place. This change could be in the form of a change in the average temperature or precipitation pattern.
  • The rate of climate change is dependent on causal factors, which may be gradual or drastic, regional or global.

The causes of Climate Change can be broadly divided into natural and anthropogenic causes as follows

Natural Factors 1. Changing physiology of the Earth
2. Volcanism
3. Changing Carbon Sink
Anthropogenic Factors 1. Green House Gas Emissions
2. Atmospheric Aerosols
3. Changing land-use pattern

What is Global Warming?

  • Global Warming is the increase in the average temperature of Earth’s atmosphere leading to changes in global climate patterns. 
  • The primary reason behind global warming is the addition of an excessive amount of Green House Gases by humans since the inception of the Industrial Revolution.

Green House Effect

The Earth gets heat from the Sun in the form of short waves (like sunlight). These short waves pass through the atmosphere easily and warm the Earth’s surface. Once the Earth’s surface is heated, it sends this heat back into the atmosphere in the form of long waves (like infrared radiation). But here’s the catch — some gases in our atmosphere, called Greenhouse Gases (GHGs)trap these long waves. They allow sunlight in but stop some of the heat from escaping back into space.

This trapped heat warms the atmosphere — this is known as the Greenhouse Effect.

Green House Effect

The Greenhouse Effect is completely natural and very important. Without it, the Earth would be about 33°C colder than it is today. That means most of the Earth would be frozen, and life would not be possible. So, while we hear a lot about it in the context of global warming, remember: a natural greenhouse effect is necessary for life.

Over the last few centuries, human activities such as burning fossil fuels (coal, petrol, diesel), deforestation, industrial processes, and large-scale agriculture have added more and more greenhouse gases to the atmosphere. As a result, the natural balance has been disturbed. The concentration of of greenhouse gases has increased, trapping too much heat. Now, less heat is escaping into space, causing the Earth’s temperature to rise abnormally. This is known as Global Warming

Concept of Climate Change

1. Water Vapour

  • Water Vapour is the most abundant GHG, but it doesn’t play an essential role in climate change as it spends a very short time in the Earth’s atmosphere. 
  • The water vapour varies rapidly with the season, altitude and region.

2. Carbon Dioxide

  • Carbon Dioxide is the most crucial GHG in climate change as it is produced naturally and through anthropogenic activities. 
  • Natural sources of CO2 include animal respiration and volcanic eruptions. On the other hand, anthropogenic causes include burning fossil fuels and deforestation. 

3. Methane

  • The primary sources of Methane are the decomposition of organic matter and the digestion process of ruminants (like cows, goats etc.). 
  • But Green House potential of Methane is far more than that of Carbon Dioxide. Hence, even a lesser amount of Methane can cause much more damage. 

4. Nitrous Oxide

  • Nitrous Oxide is a very powerful Green House Gas that is produced during the manufacturing and use of nitrogenous fertilizers. 

5. Chloro Floro Carbons (CFCs)

  • CFCs are manmade chemicals used in refrigerants and air conditioners, having considerable GHG potential and posing a great danger to Earth’s Ozone Layer.

Factors affecting the Climate Change

Climate Change resulting from the change in energy entering and leaving the planet’s system can be caused by natural and anthropogenic factors.

Factors affecting the Climate Change

Natural causes include continental drift, volcanoes, ocean currents, the Earth’s tilt, and comets and meteorites.

1. Continental Drift and Plate Tectonics

  • Due to plate tectonics, continents keep on changing their position. 
  • This drift impacts the climate because it changes the position and features of landmasses, such as a change in the flow of ocean currents and winds, which affects the climate.

2. Milanković Cycle / Variations in the Earth’s Orbit

A Serbian scientist named Milutin Milanković discovered in the 1900s that the way the Earth moves around the Sun isn’t always the same. Over thousands of years, the shape of Earth’s orbit, its tilt, and its wobble all change slowly. These changes happen because of the gravitational pull from the Sun, the Moon, and even other planets. Together, these movements are called Milanković Cycles.

Here’s how they affect the climate:

  • Sometimes, the Earth is tilted more or less, which changes how much sunlight different parts of the Earth receive.
  • Sometimes, the Earth’s orbit is more round or more oval, which affects how close or far we are from the Sun during different seasons.
  • Sometimes, the Earth wobbles like a spinning top, which shifts the timing of seasons.

All these small changes add up over thousands of years and can cause natural shifts in Earth’s climate, like ice ages (glacial periods) or warmer times (interglacial periods).

3. Volcanic Activity

  • Volcanic eruptions result in an outburst of Green House Gases (especially Sulphur dioxide) and ash, impacting climatic patterns. 
  • For example, massive volcanic eruptions 56 million years ago raised the global temperature by 8° C, and it took around 50,000 years to stabilize the climate.

4. Ocean Currents

On longer time scales, thermohaline circulation plays a crucial role in redistributing heat by extremely slow and deep transportation of the ocean water and redistributing the heat globally.


1. Green House Gases

  • Natural Green House Effect helps make Earth a habitable place by maintaining the average temperature on Earth at around 14°C instead of -19°C without the Green House Effect.
  • But human activities can increase the concentration of Green House gases leading to global Warming. 

2. Excessive Deforestation

  • Excessive Deforestation has been carried out worldwide as a source of wood and to convert forest land to agricultural land. Dense forests help absorb carbon dioxide and reduce the Green House Effect.

Forcings

Forcings mean the initial drivers of climate change, such as insolation, Green House Gases, aerosols, smoke, dust etc.

You can think of forcings like someone turning the knob on a heater or cooler — they are the initial reasons why Earth’s temperature goes up or down.

Forcings

Feedback Effect

Feedbacks are the processes that can amplify or reduce the effects of forcings.

In other words, due to the warming of the Earth, numerous changes occur in Earth’s atmosphere, which can impact the temperature. These factors are called Feedback impacts. Some of these changes can increase the temperature, while others can cool down the atmospheric temperature.


1. Feedback from Water Vapour

  • Water vapour is one of the most crucial feedback effects. A slight warming of the Earth due to more sunlight or an increased greenhouse effect will increase the quantity of water vapour in the atmosphere. As water vapour is also a greenhouse gas, the extra water vapour will increase the greenhouse effect even more. Thus water vapour has an amplifying effect on global warming. 

2. Feedback from Snow and Ice-Cover

  • The feedback effects from ice and snow-covered surfaces are similar. When the climate is cold, there is a lot of ice and snow on Earth, and the shiny surface reflects back sunlight to make it colder. But warmer climate results in lesser snow which leads to less reflection of solar radiation to outer space and increased warming. 

3. Feedback from Clouds

  • All clouds both cool the Earth by reflecting sunlight into space and warm it up by absorbing heat from the surface.  
  • The feedback effect depends upon the type of cloud.
    • Thin Cirrus Clouds (which appear high up in the atmosphere) generally have a warming effect. 
    • On the other hand, low Cumulus and Stratus clouds have a cooling effect. 
Feedback Effect

Carbon Footprint

  • Carbon footprint measures the total GHG emissions (under Kyoto Protocol) caused directly & indirectly by a person, organization, event or product.
  • GHGs under Kyoto Protocol are
    1. Carbon Dioxide 
    2. Methane
    3. Nitrous Oxide
    4. Hydro Fluro Carbon
    5. Per Fluro Carbon
    6. Sulphur Hexaoxide 
  • Carbon Footprint is expressed as tons of CO2 equivalent (tCO2e). tCO2e is calculated by multiplying the emissions of each of 6 GHGs by their 100-year Global warming potential.

How can I reduce my Carbon Footprint?

How can I reduce my carbon footprint?

Global Warming Potential

Global Warming Potential for a gas is the measure of the total energy that a gas absorbs over a particular period, usually 100 years, compared to Carbon Dioxide. 

Gas GWP Lifetime years
CO2 1 50-200
CH4 21 12
Nitrous oxide 310 120
HFCs 140-12000 1-270
PFCs 6500-9200 800-50,000
SF6 23,900 3200

Side Topic: Carbon Bombs

Carbon Bombs
  • It is “an oil or gas project that will result in at least a billion tons of CO2 emissions over its lifetime.”
  • As of the end of 2022, there are 195 carbon bomb projects worldwide. These include projects such as
    1. Carmichael Coal Project in Australia, owned by the Adani Group
    2. Gevra Coal Mines in Chhattisgarh, owned by Coal India
    3. Rajmahal Coal Mines in eastern Jharkhand 

Ecological Footprint & Debt

Ecological Footprint
  • It is the measure of human demand on the Earth’s ecosystem. The ecological footprint represents the impact that an entity (nation/town/individual) made on Earth that year by consuming Earth’s resources.  
  • Global Hectare is the average productive land and water an individual requires to produce all the resources it consumes. In 2007, it was 2.7 Hectares /Person.

It is the volume of freshwater used to produce goods and services by an individual or community.

It is of the following types

Blue WFP Blue Water Footprint is the volume of freshwater evaporated from global blue water resources, such as rivers, ponds, lakes, wells, etc.,  for producing goods and services used by an individual or community.
Green WFP Green Water Footprint is the volume of freshwater evaporated from global green water resources such as moist lands, wetlands, farms, soil etc.,  for producing goods and services used by an individual or community.
Grey WFP Grey Water Footprint is the volume of fresh water polluted for producing goods and services used by an individual or community.

Ecological Debt can be defined as the amount by which the consumption of resources from within an ecosystem exceeds the ecosystem’s regenerative capacity.

Ecological Debt

  • Ecological Debt Day or Earth Overshoot Day refers to the calendar date when the total resources consumed by humanity will exceed the capacity for Earth to generate those resources that year. 
  • It is not a fixed date but keeps on changing each year. WWF and Global Footprint Network decide it.
Ecological Debt Day or Earth Overshoot Day - Concept of Climate Change

  • It is celebrated on 22 April (every year) to increase awareness of environmental safety among ordinary people. 
  • UNESCO organizes it.

Marine Pollution

Marine Pollution

Last Updated: Dec 2024

This article deals with ‘Marine Pollution – UPSC.’ This is part of our series on ‘Environment’ which is an important pillar of the GS-3 syllabus. For more articles on Environment, you can click here.


Introduction

Marine Pollution is the spread of chemicals, particles, industrial, agricultural & residential wastes, and noise or invasive organisms in the marine environment. 


Effects of Marine Pollution

Marine Pollution
  • Bioaccumulation of toxins in zooplanktons & phytoplanktons 
  • Eutrophication
  • Ocean acidification 
  • Coral bleaching

Causes

Causes of Marine Pollution
  • Oil Spills: From ships carrying oil or from accidents in the deep ocean oil extraction facilities. 
  • Eutrophication: It results due to the fertilizer runoff from the farms. Eutrophication has created dead zones in several parts of the world, including the Gulf of Mexico and the Baltic Sea. 
  • Disposal of sewage and solid garbage
  • Spread of invasive organisms: Invasive species multiply rapidly due to the absence of natural predators and damage the original ecosystem. E.g. zebra mussel in Great Lakes from the Black Sea in 1988. 
  • Increasing levels of atmospheric CO2 make the oceans more acidic, affecting calcifying organisms.

Steps taken by the International Community

  • United Nations Convention on the Law of the Sea (UNCLOS): The convention acts as an effective international law regarding seas and oceans. 
  • London Convention: To prevent deliberate Marine Pollution by dumping wastes (India is not a member of the London Convention). 
  • International Maritime Organisation  (a UN specialized agency) has developed a number of legal frameworks related to the marine environment.
  • Bunker Convention for effective compensation for damage caused by oil spills
  • Ballast Water Management Convention

Indoor Air Pollution

This article deals with ‘Indoor Air Pollution – UPSC.’ This is part of our series on ‘Environment’ which is an important pillar of the GS-3 syllabus. For more articles on Environment, you can click here.


Apart from outdoor pollution, the peculiar situation in India is that it also suffers from indoor contamination caused by smoky chulhas. Such exposure to the smoke of Chulhas is equivalent to inhaling carcinogens from two packs of cigarettes a day. Moreover, they impact the health of pregnant women and newborns adversely.


  • Charcoal & Wood Burning lead to an increase in the concentration of VOCs and PM 2.5 & 10. According to the Economic Survey of India, there is a lack of access to better forms of energy. 51% of households still use firewood for cooking.
Indoor Pollution
  • Poorly Ventilated Dwellings (especially in slums) 
  • Asbestos released from the construction material
  • Tobacco Smoking within the household. 
  • Biological Pollution which includes pollen from plants, hair from pets, fungi etc.


  • It results in acute and chronic respiratory conditions, lung cancer and cataract. 
  • It results in Sick Building Syndrome (a situation in which the occupants experience acute health issues due to time spent in the building).
  • Women are disproportionately impacted because they work on chulhas.
  • The impact on children is more because their coping capacity is low.

  • The government has launched Pradhan Mantri Ujjwala Yojana (PMUY) to provide LPG connection to BPL households (by the Petroleum Ministry and part of Swatch Bharat Abhiyaan). 
  • Scientists have developed a graphene-based sensor to detect air pollution in homes. 
  • Neerdhur: National Environmental and Engineering Research Institute (NEERI) has developed ‘Neerdhur’, a novel multi-fuel domestic cooking stove. 
  • National Efficient Cooking Program (NECP): Launched in 2023 to revolutionize cooking practices in India by deploying 20 Lakh induction-based cook stoves across India.
  • Unnat Chulha Abhiyan Program (2014): For the promotion of improved biomass cookstoves in the country to reduce consumption of fuel wood with higher efficiency and low emissions. 
  • HEPA Filters (High Energy Particulate Arrestor): HEPA Filters are used as Indoor air filters. But they are just for particulate matter. 
  • WAYU (Wind Augmentation Purifying Unit): WAYU is made by CSIR-NEERI. It has filters for removing Particulate Matter along with activated carbon (charcoal) and UV lamps for removing poisonous gases.  
  • SDG 7 aims to ensure access to affordable, reliable, sustainable and modern energy for all.
Indoor Air Pollution

Wildlife Protection Schemes

Wildlife Protection Schemes

This article deals with ‘Wildlife Protection Schemes – UPSC.’ This is part of our series on ‘Environment’ which is an important pillar of the GS-3 syllabus. For more articles on Science and technology, you can click here.


Introduction

Wildlife Protection Schemes

The government is running 3 schemes for wildlife protection

  • Integrated Development of Wildlife Habitats (IDWH)
  • Project Tiger
  • Project Elephant

1. Project Tiger

About Tiger

  • Tiger has eight subspecies in total, and three have been extinct of these. Of the five remaining subspecies, only one subspecies is found in India, i.e. Bengal Tiger (Panthera Tigris Tigris). 
  • 70% of the total tiger population in the world is found in India.
  • Tiger is the national animal of both India & Bangladesh
  • Status of Tiger
    • IUCN Red List: Endangered 
    • Wildlife protection Act: Schedule 1 (maximum protection)
    • CITES: Appendix 1 

Project Tiger

1900 20,000 to 40,000 tigers were present in India
1972 The number of tigers reduced to 1800.
1973 The government started Project Tiger to combat this alarming situation

About Project Tiger

  • Project Tiger is run as Core Scheme, i.e. union and state governments share expenses in the 60:40 ratio.  
  • It is administered by National Tiger Conservation Authority (NTCA).

National Tiger Conservation Authority of India (NTCA)

  • It is a statutory body constituted under the provisions of the Wildlife Protection Act.
  • Minister of Environment and Forests heads NTCA.

Procedure to make Tiger Reserve

  • The state government can notify any area as Tiger Reserve on the recommendation of NTCA.

Objective of Project Tiger

  • Ensuring the maintenance of a viable Tiger population in India for scientific, economic, aesthetic, cultural and ecological value

Parts of Tiger Reserves

Core Area No human activity is allowed except anything that affects the rights of the scheduled tribes and forest dwellers.
Buffer Area Limited non-commercial activity such as development is allowed.
There is a co-existence of man and wildlife Gram Sabha is consulted in the management of buffer areas. 

Alteration in boundary

  • No alteration can be made except on the recommendation of NTCA and approval of the National Board for Wildlife.

Recent initiatives

  • Strengthening of anti-poaching activities by the deployment of anti-poaching squads involving ex-army personnel/home guards
  • Reintroduction of tigers has been done at Sariska (Rajasthan), Panna (MP), Satkosia (MP) and Rajaji Tiger Reserve (Uttarakhand) tiger reserves.

Problems with project tiger

1. Funds

  • Funds received by a majority of tiger reserves are usually inadequate & delayed.

2. Staff

  • Forest Guards are usually trained only once during the course of their employment. Proper training is also lacking. 

3. Infrastructure

  • Roads, wireless equipment, jeeps, arms and ammunition and other  anti-poaching equipment are lacking.

4. Constitutional angle

  • Forests and Wildlife are placed under the concurrent list in the Indian Constitution. Hence, the Central Government has limited powers over the execution of Project Tiger. Thus, while the guideline issued by the Central Government may be sound, their translation into ground realities depends totally on the State Government’s commitment.  

Tiger Reserves in India

Tiger Habitats in India can be divided into 5 divisions i.e.

  1. Shivalik Gangetic Plains
  2. Central India and the Eastern Ghats
  3. Western Ghats
  4. Sunderbans
  5. North Eastern Hills and Brahmaputra Flood Plains

There are 52 Tiger Reserves in 17 States. The important ones are listed below

Corbett Uttarakhand
Dudhwa UP
Valmiki Bihar
Ranthambore Rajasthan
Sariska Rajasthan
Kanha MP
Bandhavgarh MP
Panna MP
Pench MP
Guru Ghasidas Chhattisgarh
Pench Maharashtra
Bandipur Karnataka
Nagarhole Karnataka
Periyar Kerala
Anamalai Tamil Nadu
Mudumalai Tamil Nadu
Simplipal Odisha
Sunderbans West Bengal
Buxa West Bengal
Kaziranga Assam
Manas Assam
Namdapha Arunachal Pradesh

Reasons for decrease in tiger population

1. Habitat loss

  • Because of Deforestation, the size of tiger prey (deer, sambar etc.) has declined.  
  • Forest fires and floods are leading to habitat loss.

2. Disturbance in Tiger breeding/ reproduction

  • Highways, noise pollution, tourism etc., disrupt the tiger breeding, thus impacting their population. 

3. Area constraint/fragmentation of area

  • Tiger is a territorial animal which advertises its presence in an area through urine marking and maintains a territory. Hence, 80-100 tigers need a protected and undisturbed area of 1000 sq km. In its absence, male tigers would fight and kill each other. Due to the construction of highways and farming activities, the habitats are getting fragmented. 

4. Insurgency in North East and Naxals in Central India

  • The Forest departments cannot efficiently work and protect tigers. 
  • Using illegal trade in these to fund their operations 

5. Black market of tiger bones and organs

  • China has a big market for tiger bones and organs where these organs are used for enhancing male virality.

Why do we need to protect tigers?

  • Tiger is an “umbrella species“. It resides at the top of the forest food chain. A healthy tiger population indicates that the other ecological components in its habitat are equally robust since tigers need a large amount of prey and good habitat. 
  • If the Umbrella species are protected, it will also ensure viable populations of other wild animals (co-predators like leopards and prey like dears) and the habitat (trees, shrubs, water).  

Transfer Projects

1. Lion to Tiger Territory

  • There is a proposal to shift lion from Gujarat to Kuno-Palpur National Park, MP
  • Reason: All Lion population in Gujarat which makes them vulnerable.
  • Problem: Gujarat government considers it PRIDE OF THE STATE & refusing to share it with MP.

2. Interstate Tiger Cub transfer

  • From  Bandhavgarh and Kanha in MP to Satkosia in Odisha.  
  • Tigers were transferred in 2018. But this led to massive protests by the locals as they were not consulted in the whole process. One of the tigers started to raid human habitations leading to Man-Animal conflict. Hence, the project was shelved, and Tiger was transferred back to MP.

Tiger census-2018

Tiger census is the all India tiger estimation exercise happening since 2006. The Tiger Census is carried out after a gap of every three years by NTCA.

Project Tiger

M – STRiPES

  • M-STRiPES, or Monitoring System for Tiger Intensive Protection & Ecological Status, is software developed by the Wildlife Institute of India.
  • It is a software-based Monitoring system for tigers.
  • It uses e-Eye system using thermal cameras. 
  • The Indian government launched it in 2010.
  • The Tiger Census is also conducted using M-STRiPES.

2. Project Elephant

Project Elephant
Scientific Name Elephas Maximus
IUCN status Endangered
Population 25,000 in India
Heritage Animal The elephant was declared National Heritage Animal in 2010

Project Elephant

  • Project Elephant was launched in 1992 as a centrally Sponsored Scheme

Objectives

  • Protect elephants, their habitat and corridors
  • To address the issue of man-animal conflict
  • Ensure the welfare of the domesticated elephants 
  • Strengthening of protection from the poachers and unnatural causes of death
  • Public education and awareness
  • Providing Veterinary care

Elephant Reserves

There are a total of 30 elephant reserves in India.

Important ones are

Singhbhum Jharkhand
Mayurbhanj Odisha
Sambhalpur Odisha
Kameng  Arunachal
Singhpan Nagaland
Kaziranga Assam
Wayanad Kerala
Periyar Kerala
Anaimalai Tamil Nadu

Elephant Corridors

  • Elephant Corridors are narrow land for the passage of elephants from one habitat to another. 
  • There are 183 identified Elephant Corridors in India.

Reasons for decrease in population

  • Poaching for elephant ivory 
  • Disruption of habitat
  • Man animal conflict 
  • Mining activities in central India
  • Train hits 

Monitoring of Illegal Killing of Elephants (MIKE) Program

  • It was established in 2003 by CITES.
  • It is an international collaboration that tracks trends in information related to the illegal killing of elephants across Africa and Asia to monitor the effectiveness of field conservation efforts.

3. Integrated Development of Wildlife Habitat (IDWH)

  • Project Tiger is run as Core Scheme, i.e. union and state governments share expenses in the 60:40 ratio.  
  • The aim of the scheme is  protection of the wildlife.
  • Objective
    • Support the protected areas 
    • Conservation of Wildlife outside protected areas 
    • Recovering the critically endangered species as well as habitats.

Financial and technical assistance is given to states to protect threatened 18 species like

Mammals 1. Snow Leopard
2. Bustards (including Florican)
3. Hangul
4. Nilgiri Tahr
5. Asian Wild Buffalo
6. Manipur Brow-antlered
7. Malabar civet
8. One-horned rhinoceros
9. Asiatic Lion
10. Swamp deer 
Aquatic 11. River Dolphin
12. Marine Turtles
13. Dugongs 
14. Coral Reefs
Birds 15. Edible-nest Swiftlets
16. Nicobar Megapode
17. Vultures
18. Jerdon’s Courser

3.1 Lion Conservation Project

Lion Conservation Project
  • It was launched by Environment Ministry in 2018. 
  • The aim is to protect and conserve the world’s last ranging free population of Asiatic Lion. 
  • It is funded under the Integrated Development of Wildlife Habitat (IDWH), with the contributing ratio being 60:40 of Central and State governments. 

About Asiatic Loin

  • Asiatic Lion, Panthera Leo Persica is listed in 
    • Schedule 1 of Wildlife Protection Act, 1972 
    • Appendix-I of CITES
    • Endangered category under IUCN Red List
  • Asiatic Lions are found only in the 5 protected areas of Gujarat, the most famous of which is Gir. 

Lion Transfer

  • Lion is only found in Gujarat, which makes it vulnerable to extinction in case of any disease or unwanted accident. Hence, the proposal is to transfer some lions to Kuno-Palpur National Park, Madhya Pradesh. 

3.2 Project Snow Leopard

Project Snow Leopard
  • There are around 7400 snow leopards globally, and ~10% of them are present in India (750 in India ).
  • The snow leopard is the apex predator on the ecological pyramid. Hence, it plays an important role in sustaining the ecosystem in its habitat.
  • Snow Leopard is listed in 
    • Schedule 1 of the Wildlife Protection Act 
    • Vulnerable category under IUCN Red List
  • It is found in Jammu and Kashmir, Ladakh, Himachal Pradesh, Uttarakhand, Arunachal and Sikkim.
  • In 2021, the newly created Union Territory of Ladakh declared it to be the state animal.


3.3 Vulture

  • India is home to 9 out of 23 species of vultures. These include
    1. White-rumped vulture (WRV)
    2. Long-billed vulture (LBV)
    3. Read-headed or king vulture
    4. Egyptian vulture (EV)
    5. Eurasian griffon (EG)
    6. Himalayan griffon (HG)
    7. Cinereous vulture (CV)
    8. Slender-billed vulture (SBV)
    9. Bearded vulture(BV).
  • Of these, 3 are Critically Endangered 
    1. White Backed Vulture 
    2. Slender Billed Vulture 
    3. Long-Billed Vulture 
  • Other points about Vultures
    • Vultures nest on tall trees and rocky cliffs. 
    • They are slow breeders. Hence, the survival of every individual is essential.
    • They have excellent eyesight and smelling sense and can detect the presence of dead animals from great distances. 
    • They don’t hunt and rely on other carnivores for carcasses. But they have strong bills and necks adapted to tear flesh from carcasses. Further, vultures have acidic stomachs, which help them to digest rotting carcasses. 

Causes of their deaths

  • Bioaccumulation of Diclofenac leads to kidney failure in vultures culminating in their death.
Bioaccumulation of Diclofenac

Other minor reasons

  • Hunting and trading because of myths about the medicinal power of vultures.
  • Habitat destruction due to rapid urbanization. 
  • Electrocution in the areas with lesser trees.

Program for Protection

  • The use of Diclofenac has been banned in India.
  • Vulture has been brought under Integrated Development of Wildlife Habitat (IDWH)
  • Vulture Safe Zones : 3 such zones have been created – from Uttarakhand to Nepal, Assam to Arunachal and Central India
  • Vulture Breeding Facilities: Breeding facilities have been created in Guwahati, Pinjore and Buxa (WB)
  • Ramadevarabetta Vulture Sanctuary: It is India’s only vulture sanctuary in Karnataka
  • ‘Vulture Restaurants/Cafeteria’: These are elevated spots located strategically, for example, in Punjab and Maharashtra, where dead animals are kept for vultures to feed. 

Consequences of these disappearances

  • The disappearance of vultures has allowed other species, such as rats and wild dogs, to take their place. These new scavengers, however, are not as efficient as vultures. Vulture’s metabolism is a true “dead end” for pathogens, but dogs and rats become carriers of the pathogens. Thus, they are directly or indirectly responsible for thousands of human deaths. 

3.4 Rhino

  • Rhino is listed in
    • Schedule 1 of the Wildlife Protection Act 
    • Vulnerable category under IUCN Red List
  • There are around 3000 Rhinos in the world. 
  • In India, Rhino is found in North Bihar, North West Bengal and the Brahmaputra valley of Assam. But 95% of the world population is found in Kaziranga & Orang National Park in Assam.

Reasons for poaching

The reason for poaching is a great demand of horns of Rhino due to

  • Use of Rhino horn in Chinese medicines.
  • The Rhino horn is considered a status symbol in countries such as Vietnam.

3.5 Project Hangul/Kashmiri Stag

  • Hangul or Kashmiri Stag is a CRITICALLY ENDANGERED species under IUCN Red List. 
  • There were only 160 mature individuals of Hangul in 2008 
  • Project Hangul was started in 1975 by the J&K government, IUCN and WWF. Presently under IDWH
  • It is also the state animal of J&K. 
  • The main population is in Dachigam National Park, Srinagar.


3.6 Gangetic Dolphin

  • In 2010, Government declared Gangetic Dolphin as the National Aquatic Animal.  
  • It is listed in the
    • Schedule 1 of the Wildlife (Protection) Act  
    • Endangered on IUCN Red List.
  • It is found in parts of the Ganga Brahmaputra river system. More than 50% of Gangetic Dolphin are found in Bihar. 
  • The Gangetic Dolphin symbolizes the purity of Ganga as it can survive only in freshwater.
  • It is also known as Susu or Sushak, or Souns because of its noise. 

Side Topic: River Dolphins

  • There are a total of 4 freshwater dolphins in the world i.e. 
    1. Baiji or Yangtze Dolphin (China)
    2. Boto or Amazon Dolphin 
    3. Bhulan or Indus Dolphin
    4. Susu or Gangetic Dolphin.

Main reasons for population decline

  1. Poaching for oil 
  2. Habitat degradation due to declining flow 
  3. Heavy siltation 
  4. Sand mining 
  5. The construction of barrages causes population fragmentation due to physical barriers 
  6. Increasing traffic due to the declaration of Ganga as National Waterways

Steps taken for preservation of Gangetic Dolphin

  • Project Dolphin 
    • Ministry of Environment announced it in 2020 on the lines of ‘Project Tiger’.
    • It involves the conservation of dolphins through the use of modern technology and engages local fishing communities in the conservation process.
  • National Dolphin Research Centre has been established at Patna University.
  • Vikramshila Gangetic Dolphin Sanctuary has been established in Bihar.

Side Topic: Indus Dolphin

  • Indus Dolphin are endangered, freshwater, and functionally blind species of dolphins relying on echolocation for navigation, communication and hunting prey.
  • India has a population of around 30 Indus Dolphins in the Beas River. The rest of the population is found in the Indus river in Pakistan. 
  • Punjab declared it as its state aquatic animal in 2019.
  • In 2021, the Punjab government, along with WWF-India, conducted the first organized census on the population of Indus Dolphin. 


3.7 Nilgiri Tahr

  • Nilgiri Tahr is the state animal of Tamil Nadu.
  • It is listed in 
    • Schedule 1 of the Wildlife (Protection) Act  
    • Endangered on IUCN Red List
  • It is endemic to the narrow belt of the higher elevation of Shola Forest in the Western Ghats.