UPSC CSE 2026 Essay Paper Discussion
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General Studies Paper 3 · By subject

Environment & Ecology — UPSC Mains GS Paper 3 PYQ

79 previous year questions on Environment & Ecology, 2013–2026, each with a model answer

← All GS Paper 3

2026

  1. Q8
    Discuss the aim and goals of Kunming-Montreal global biodiversity framework. Mention India’s commitments and initiatives to achieve the goals and targets of this framework giving suitable examples.
    10 marks 150 words Medium Model answer →
  2. Q17
    What are the challenges to solid waste management in India? Discuss the governmental policy framework on solid waste management. Discuss the success/failure cases of Delhi and Indore cities highlighting the salient feature of their solid waste management initiatives.
    15 marks 250 words Medium Model answer →

2025

  1. Q7
    What is Carbon Capture, Utilization and Storage (CCUS)? What is the potential role of CCUS in tackling climate change?
    10 marks 150 words Medium Model answer →
  2. Q8
    Seawater intrusion in the coastal aquifers is a major concern in India. What are the causes of seawater intrusion and the remedial measures to combat this hazard?
    10 marks 150 words Medium Model answer →
  3. Q13
    Examine the factors responsible for depleting groundwater in India. What are the steps taken by the government to mitigate such depletion of groundwater?
    15 marks 250 words Medium Model answer →
  4. Q17
    Mineral resources are fundamental to the country’s economy and these are exploited by mining. Why is mining considered an environmental hazard? Explain the remedial measures required to reduce the environmental hazard due to mining.
    15 marks 250 words Medium Model answer →
  5. Q18
    Write a review on India’s climate commitments under the Paris Agreement (2015) and mention how these have been further strengthened in COP26 (2021). In this direction, how has the first Nationally Determined Contribution intended by India been updated in 2022?
    15 marks 250 words Medium Model answer →

2024

  1. Q7
    Industrial pollution of river water is a significant environmental issue in India. Discuss the various mitigation measures to deal with this problem and also the government’s initiatives in this regard.
    15 marks 250 words Medium Model answer →
  2. Q8
    What role do environmental NGOs and activists play in influencing Environmental Impact Assessment (EIA) outcomes for major projects in India? Cite four examples with all important details.
    10 marks 150 words Medium Model answer →
  3. Q15
    The world is facing an acute shortage of clean and safe freshwater. What are the alternative technologies which can solve this crisis? Briefly discuss any three such technologies citing their key merits and demerits.
    15 marks 250 words Medium Model answer →

2023

  1. Q8
    What is oil pollution? What are its impacts on the marine ecosystem? In what way is oil pollution particularly harmful for a country like India?
    15 marks 250 words Medium Model answer →
  2. Q15
    The adoption of electric vehicles is rapidly growing worldwide. How do electric vehicles contribute to reducing carbon emissions and what are the key benefits they offer compared to traditional combustion engine vehicles?
    15 marks 250 words Medium Model answer →
  3. Q17
    Comment on the National Wetland Conservation Programme initiated by the Government of India, and name a few Indian wetlands of international importance included in the Ramsar Sites.
    15 marks 250 words Medium Model answer →
  4. Q18
    The Intergovernmental Panel on Climate Change (IPCC) has predicted a global sea level rise of about one metre by AD 2100. What would be its impact on India and the other countries in the Indian Ocean region?
    15 marks 250 words Medium Model answer →

2022

  1. Q6
    Each year a large amount of plant material — cellulose — is deposited on Earth’s surface. What natural processes does this cellulose undergo before yielding carbon dioxide, water, and other end products?
    10 marks 150 words Medium Model answer →
  2. Q7
    Discuss in detail photochemical smog, emphasizing its formation, effects, and mitigation. Explain the 1999 Gothenburg Protocol.
    15 marks 250 words Medium Model answer →
  3. Q17
    Discuss global warming and mention its effects on the global climate. Explain the control measures to bring down the level of greenhouse gases which cause global warming, in the light of the Kyoto Protocol (1997).
    15 marks 250 words Medium Model answer →
  4. Q18
    Explain the causes and effects of coastal erosion in India. What are the available coastal management techniques for combating this hazard?
    15 marks 250 words Medium Model answer →

2021

  1. Q6
    Explain the purpose of the Green Grid Initiative launched at the World Leaders’ Summit of the COP26 UN Climate Change Conference in Glasgow (Nov 2021). When was this idea first floated in the International Solar Alliance (ISA)?
    10 marks 150 words Easy Model answer →
  2. Q7
    Describe the key points of the revised Global Air Quality Guidelines (AQGs) recently released by the WHO. How are these different from its last update in 2005? What changes in India’s NCAP are required to achieve these revised standards?
    15 marks 250 words Hard Model answer →
  3. Q17
    Describe the major outcomes of the 26th session of the Conference of the Parties (COP) to the UNFCCC. What commitments did India make at this conference?
    15 marks 250 words Medium Model answer →

2020

  1. Q1
    Explain intra-generational and inter-generational issues of equity from the perspective of inclusive growth and sustainable development.
    10 marks 150 words Medium Model answer →
  2. Q7
    How does the draft Environment Impact Assessment (EIA) Notification, 2020 differ from the existing EIA Notification, 2006?
    10 marks 150 words Medium Model answer →
  3. Q8
    What are the salient features of the Jal Shakti Abhiyan launched by the Government of India for water conservation and water security?
    10 marks 150 words Easy Model answer →
  4. Q17
    What are the key features of the National Clean Air Programme (NCAP) initiated by the Government of India?
    10 marks 150 words Easy Model answer →

2019

  1. Q7
    Coastal sand mining, whether legal or illegal, poses one of the biggest threats to our environment. Analyze the impact of sand mining along India’s coasts, citing specific examples.
    15 marks 250 words Medium Model answer →
  2. Q17
    Define the concept of “carrying capacity” of an ecosystem as relevant to the environment. Explain how understanding this concept is vital while planning for sustainable development of a region.
    15 marks 250 words Medium Model answer →

2018

  1. Q6
    What are the impediments to disposing of the huge quantities of discarded solid waste that are continuously being generated? How do we safely remove the toxic wastes accumulated in our habitable environment?
    15 marks 250 words Medium Model answer →
  2. Q7
    What is a wetland? Explain the Ramsar concept of ‘wise use’ in the context of wetland conservation. Cite two examples of Ramsar sites from India.
    15 marks 250 words Easy Model answer →
  3. Q8
    Sikkim is the first ‘Organic State’ in India. What are the ecological and economic benefits of an Organic State?
    15 marks 250 words Medium Model answer →
  4. Q17
    How does biodiversity vary in India? How is the Biological Diversity Act (2002) helpful in the conservation of flora and fauna?
    15 marks 250 words Medium Model answer →

2017

  1. Q8
    Not many years ago, river linking was a concept but it is becoming a reality in the country. Discuss the advantages of river linking and its possible impact on the environment.
    15 marks 250 words Medium Model answer →
  2. Q17
    ‘Climate change’ is a global problem. How will India be affected by climate change? How will the Himalayan and coastal states of India be affected?
    15 marks 250 words Medium Model answer →

2016

  1. Q11
    Give an account of the current status and the targets to be achieved pertaining to renewable energy sources in the country. Discuss briefly the importance of the National Programme on Light Emitting Diodes (LEDs).
    15 marks 250 words Medium Model answer →
  2. Q14
    Rehabilitation of human settlements is one of the important environmental impacts which always attract controversy while planning major projects. Discuss measures suggested for mitigation of this impact while proposing major developmental projects.
    15 marks 250 words Medium Model answer →

2015

  1. Q9
    To what factors can the recent dramatic fall in equipment costs and the tariff of solar energy be attributed? What implications does the trend have for thermal power producers and the related industry?
    15 marks 250 words Medium Model answer →
  2. Q15
    Discuss the Namami Gange and National Mission for Clean Ganga (NMCG) programmes and the causes of mixed results from previous schemes. What quantum leaps can help preserve the river Ganga better than incremental inputs?
    15 marks 250 words Medium Model answer →

2014

  1. Q13
    Should the pursuit of carbon credit and clean development mechanism set up under the UNFCCC be maintained, even though there has been a massive slide in the value of carbon credit? Discuss with respect to India’s energy needs for economic growth.
    15 marks 250 words Medium Model answer →
  2. Q15
    Environmental Impact Assessment studies are increasingly undertaken before a project is cleared by the Government. Discuss the environmental impacts of coal-fired thermal plants located at coal pitheads.
    15 marks 250 words Medium Model answer →

2013

  1. Q11
    Write a note on India’s green energy corridor to alleviate the problems of conventional energy.
    10 marks 150 words Medium Model answer →
  2. Q19
    What are the consequences of illegal mining? Discuss the Ministry of Environment and Forests’ concept of ‘Go’ and ‘No-Go’ zones for the coal mining sector.
    10 marks 150 words Medium Model answer →
  3. Q20
    Enumerate the National Water Policy of India. Taking the river Ganges as an example, discuss the strategies that may be adopted for river-water pollution control and management. What are the legal provisions for the management and handling of hazardous wastes in India?
    15 marks 250 words Hard Model answer →

0

  1. •
    Urban disasters in India are increasingly driven by governance failures rather than natural hazards alone. Examine the unique characteristics of urban disasters, the structural vulnerabilities of Indian cities, and suggest a comprehensive urban disaster risk reduction framework.
    15 marks 250 words Hard Model answer →
  2. •
    Urban tourism is placing severe ecological and social pressures on India’s most fragile destinations — from the Himalayas to coastal zones. In this context examine the concept of sustainable tourism and evaluate India’s policy framework with the National Strategy for Sustainable Tourism 2022.
    15 marks 250 words Hard Model answer →
  3. •
    The Disaster Management (Amendment) Act, 2025 marks a paradigm shift from reactive relief to proactive risk governance. Critically examine the key changes introduced by the Amendment and assess whether they adequately address India’s evolving disaster risk landscape.
    15 marks 250 words Hard Model answer →
  4. •
    Heat waves in are becoming more frequent, intense, and geographically widespread. Examine the gaps in India’s heat governance.
    10 marks 150 words Hard Model answer →
  5. •
    Green mobility in India is continuously promoted these days. Critically examine which pathways are most suited to India’s developmental context and identify the structural challenges that limit their adoption.
    15 marks 250 words Hard Model answer →
  6. •
    India’s revised Seismic Zonation Map (BIS, 2025) introduces a new Zone VI covering the entire Himalayan arc for the first time. Examine the significance of this revision and its implications for infrastructure planning and disaster governance.
    10 marks 150 words Hard Model answer →
  7. •
    The cryosphere of the Hindu Kush Himalayan region is approaching irreversible tipping points. Examine the ecological implications of glacial retreat for India’s water security, disaster vulnerability, and downstream river ecosystems.
    15 marks 250 words Hard Model answer →
  8. •
    The CRZ Notification, 2019 has been criticised for progressively diluting coastal environmental safeguards in favour of development. Examine the major challenges in India’s coastal regulatory framework and assess whether Integrated Coastal Zone Management offers a more effective alternative.
    15 marks 250 words Hard Model answer →
  9. •
    CBDR-RC is not merely a principle of emission responsibility — it is equally a principle of financial and technological obligation. Examine the extent to which developed countries have fulfilled their CBDR-RC obligations on climate finance and technology transfer, and the implications of this failure for developing countries.
    10 marks 150 words Hard Model answer →
  10. •
    Mangrove restoration in India has gained policy momentum through the MISHTI scheme, but plantation-based approaches may not replicate the ecological value of natural mangroves. Critically examine.
    10 marks 150 words Hard Model answer →
  11. •
    “India’s conservation story is one of impressive institutional architecture and inadequate ecological outcomes — more committees than corridors, more registers than results.” Critically examine this statement.
    15 marks 250 words Hard Model answer →
  12. •
    Waste management and energy security are often treated as separate policy domains in India. Examine how an integrated Waste-to-Energy framework can simultaneously advance environmental sustainability, resource efficiency and energy security.
    15 marks 250 words Hard Model answer →
  13. •
    Extended Producer Responsibility is increasingly the centrepiece of India’s waste management strategy across municipal, plastic, e-waste, and battery streams. Examine its merits, challenges, and whether certificate trading mechanisms undermine its core purpose.
    15 marks 250 words Hard Model answer →
  14. •
    The Forest Rights Act, 2006, and the Wildlife Protection Act, 1972, reflect fundamentally different visions of conservation — one rooted in ecological integrity, the other in social justice. Discuss with recent examples.
    10 marks 150 words Medium Model answer →
  15. •
    India’s transition towards a circular economy is central to both resource security and sustainable development. Discuss.
    10 marks 150 words Medium Model answer →
  16. •
    PM-KUSUM was designed to address three simultaneous goals — farmer income, energy transition, and diesel displacement. Evaluate how far the scheme has succeeded across its three components and identify the structural reforms needed to realise its untapped potential.
    15 marks 250 words Hard Model answer →
  17. •
    Marine pollution is increasingly difficult to tackle because it is transboundary in origin, cumulative in impact, and fragmented in governance. Discuss the major sources and implications of marine pollution for India, and suggest an integrated approach for addressing it.
    15 marks 250 words Medium Model answer →
  18. •
    Groundwater contamination in India exhibits a distinct spatial pattern driven by both geogenic and anthropogenic factors. Analyse the spatial variation in groundwater contamination across India and evaluate why this has remained a governance challenge despite being a public health emergency.
    15 marks 250 words Hard Model answer →
  19. •
    India’s EV policy has evolved from FAME-I through FAME-II to PM E-DRIVE (2024). Examine how each successive scheme has shifted focus, and whether India’s current policy architecture is adequate to achieve 30% EV penetration by 2030.
    10 marks 150 words Hard Model answer →
  20. •
    India’s installed renewable energy capacity has crossed 50% mark, yet the energy transition remains fragile. Critically examine the structural bottlenecks in India’s renewable energy ecosystem, with specific reference to grid integration, storage, and the role of critical minerals.
    15 marks 250 words Hard Model answer →
  21. •
    Nuclear energy is often called ‘clean energy,’ but this label applies only to reactor operation and not to the full lifecycle from uranium mining to radioactive waste disposal. Critically examine India’s ecological readiness to manage this full lifecycle as it scales nuclear capacity to 100 GW by 2047 under the SHANTI Act, 2025.
    10 marks 150 words Hard Model answer →
  22. •
    Urban heat is emerging as a chronic disaster across Indian cities. Examine the institutional architecture of Heat Action Plans and propose reforms.
    15 marks 250 words Hard Model answer →
  23. •
    Microplastics have entered drinking water, agricultural soil and human placenta. Discuss the science, the Indian regulatory gap, and the role of the UN Global Plastics Treaty.
    10 marks 150 words Medium Model answer →
  24. •
    India’s solar capacity has crossed 100 GW but PM-Surya Ghar Muft Bijli Yojana is now the lever for rooftop solar. Examine progress, financing and integration challenges.
    10 marks 150 words Easy Model answer →
  25. •
    The Biological Diversity (Amendment) Act 2023 reshapes India’s Access and Benefit Sharing regime aligned with the Kunming-Montreal Global Biodiversity Framework. Discuss the changes and their impact on traditional knowledge.
    15 marks 250 words Medium Model answer →
  26. •
    India hosts 89 Ramsar sites and four biodiversity hotspots but conservation outcomes are uneven. Discuss the role of community-led models such as Khasi Hills REDD+ and Project Tiger.
    10 marks 150 words Easy Model answer →
  27. •
    Delhi-NCR continues to record “severe” air-quality episodes every winter. Critically evaluate the National Clean Air Programme and the airshed approach under CAQM.
    15 marks 250 words Hard Model answer →
  28. •
    Plastic Waste Management Rules and EPR are now central to India’s circular-economy push. Examine the single-use plastic ban, the EPR portal and the e-waste regime.
    10 marks 150 words Easy Model answer →
  29. •
    COP28 in Dubai produced the first “transitioning away from fossil fuels” outcome and the operationalisation of the Loss and Damage Fund. Discuss India’s positioning and the implementation deficits flagged at COP29 Baku.
    10 marks 150 words Medium Model answer →
  30. •
    India’s Environment Impact Assessment regime has been amended through draft notifications and project-specific exemptions since 2020. Examine the institutional design under EIA 2006 and the dilution concerns flagged by the Supreme Court.
    15 marks 250 words Medium Model answer →
  31. •
    The Forest (Conservation) Amendment Act 2023 has redefined the scope of “forest land.” Discuss the changes, the constitutional challenges and the implications for India’s NDC sink target.
    10 marks 150 words Medium Model answer →
  32. •
    India’s updated NDC commits to a 45% reduction in emissions intensity by 2030 and net-zero by 2070. Critically evaluate the LT-LEDS pathway and the role of CBAM in shaping India’s transition.
    15 marks 250 words Hard Model answer →
  33. •
    The National Green Hydrogen Mission targets 5 MMT of annual green hydrogen production by 2030. Examine the SIGHT incentives, the cost competitiveness challenge, and the demand-creation strategy.
    15 marks 250 words Medium Model answer →
  34. •
    India’s biodiversity governance rests on the Biological Diversity Act 2002 and its 2023 Amendment. Examine how the amendment reshapes access-benefit-sharing and traditional knowledge protection.
    10 marks 150 words Medium Model answer →
  35. •
    Urban heat is emerging as a chronic disaster in Indian cities. Critically analyse the institutional gaps in Heat Action Plans and propose a multi-sectoral response.
    10 marks 150 words Easy Model answer →
  36. •
    India’s updated NDC commits to 45% reduction in emissions intensity by 2030 and net-zero by 2070. Critically evaluate the LT-LEDS pathway and the role of CBAM in shaping India’s transition.
    15 marks 250 words Hard Model answer →
  37. •
    India aims for 500 GW non-fossil capacity by 2030. Discuss the progress of the National Green Hydrogen Mission and the integration challenges for renewable energy in India’s grid.
    10 marks 150 words Easy Model answer →

Other GS Paper 3 subjects

Science & TechnologyInternal SecurityInfrastructure financing and PPPIndian EconomyFood security, PDS and land reformsDisaster ManagementAgriculture & Food SecurityAgricultural marketing and food processing