Environment & Ecology

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

Climate change is the defining environmental challenge of our era. Global average temperatures have risen approximately 1.1°C above pre-industrial levels (1850–1900 baseline), primarily due to anthropogenic greenhouse gas emissions. The Paris Agreement (2015), adopted by 196 parties at COP21, aims to limit global warming to well below 2°C, preferably to 1.5°C, compared to pre-industrial levels. Countries submit Nationally Determined Contributions (NDCs) outlining their climate action plans.

India is one of the world’s most biodiverse countries, ranking 8th in plant species and 7th in faunal species. India has 4 biosphere reserves, 18 Ramsar sites (wetlands of international importance), and over 870 wildlife sanctuaries. The Project Tiger programme, launched in 1973, has increased India’s tiger population from around 1,800 in 1973 to approximately 3,925 in 2023 — India hosts about 75% of the world’s wild tiger population. The Asiatic Lion (Panthera leo persica) is found only in the Gir Forest National Park and surrounding areas in Gujarat, with a population of approximately 740 as of the 2023 census.

⚡ Exam tip: SNAP GK frequently tests Ramsar sites, Project Tiger numbers, the Paris Agreement temperature targets, and major environmental disasters or agreements. Note that the COP (Conference of Parties) meetings are to the UNFCCC (United Nations Framework Convention on Climate Change), not to the Paris Agreement. The next COP is COP30 in Brazil in 2025.

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🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

Climate Change — Science and Impacts

The greenhouse effect is driven by gases including carbon dioxide (CO₂, the largest contributor), methane (CH₄), nitrous oxide (N₂O), and fluorinated gases. The Keeling Curve shows atmospheric CO₂ has risen from approximately 315 ppm in 1958 to over 425 ppm in 2024 — the highest level in at least 800,000 years. Climate change impacts include rising sea levels (global mean sea level rose by approximately 20 cm in the 20th century and is accelerating), more frequent extreme weather events (cyclones, heatwaves, floods, droughts), glacier retreat in the Himalayas, and biodiversity loss.

India is among the countries most vulnerable to climate change, facing threats including: increased frequency of cyclones in the Bay of Bengal and Arabian Sea; heatwaves causing human mortality and agricultural losses; glacial lake outburst floods (GLOFs) in the Himalayas; and coastal erosion due to sea-level rise (especially in Odisha, West Bengal, Gujarat, and the Sundarbans).

India’s Climate Commitments

India’s NDCs under the Paris Agreement include:

• Reducing emission intensity of GDP by 33–35% from 2005 levels by 2030
• Achieving 40% cumulative electric power installed capacity from non-fossil fuel sources by 2030
• Creating an additional carbon sink of 2.5–3 billion tonnes of CO₂ equivalent through forest cover by 2030
• India’s net-zero target: 2070 (announced at COP26 in Glasgow, 2021)

India’s renewable energy capacity crossed 180 GW in 2024, with solar energy being the fastest-growing segment. The International Solar Alliance (ISA), co-founded by India and France in 2015, aims to promote solar energy in tropical countries.

Biodiversity and Conservation

India is a megadiverse country — one of 17 “Vanguard Countries” with high biodiversity and endemism. India’s biodiversity hotspots include the Western Ghats, Eastern Himalayas, Sundarbans, and the Indo-Burma region. India has 106 species of mammals, 1,300 species of birds, over 400 species of reptiles and amphibians, and over 45,000 plant species.

Key conservation successes in India:

• Project Tiger: 55 tiger reserves covering over 75,000 sq km; tiger population grew from ~1,800 in 1973 to ~3,925 in 2023 (latest census)
• Project Elephant: 30 elephant reserves covering ~65,000 sq km; India has the largest Asian elephant population (~30,000 elephants)
• Gir Lion Census: Asiatic lion population in Gujarat’s Gir region grew to ~740 in 2023
• Sea Turtle Project: Olive Ridley sea turtle conservation in Odisha
• Vulture Conservation: India’s vulture population has stabilised after a dramatic crash in the 1990s due to diclofenac poisoning

Pollution — Air, Water, and Solid Waste

India faces severe pollution challenges:

• Air Pollution: Delhi is consistently ranked among the world’s most polluted cities. Stubble burning in Punjab and Haryana, vehicular emissions, industrial pollution, and meteorological conditions contribute to severe winter air quality. The National Clean Air Programme (NCAP, 2019) targets a 20–30% reduction in particulate matter by 2024.
• Water Pollution: The Ganga (Holy River) remains polluted despite the ₹20,000 crore Namami Gange Programme (launched 2014). Untreated sewage, industrial effluents, and agricultural runoff are the main contributors.
• Solid Waste: India generates over 62 million tonnes of municipal solid waste annually, with alarming levels of plastic pollution in oceans and rivers. The Swachh Bharat Mission (Urban, 2.0) aims to make cities garbage-free.

Common traps in SNAP GK questions: Students confuse “COP” meetings — COP is to the UNFCCC, not the Paris Agreement. The Paris Agreement is the treaty; the UNFCCC is the broader climate convention. Tiger reserves are often confused with national parks — a tiger reserve is designated under the Wildlife Protection Act. The “One Sun, One World, One Grid” initiative is India’s solar power interconnection project, not an environmental slogan.

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🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

COP Summits and Global Climate Negotiations

The UNFCCC (United Nations Framework Convention on Climate Change) was signed at the Rio Earth Summit in 1992 and came into force in 1994. The Conference of Parties (COP) is the supreme decision-making body of the UNFCCC, meeting annually. Key COP milestones:

• COP3 (1997): Kyoto Protocol adopted — first binding emission reduction targets for developed countries (committed countries to reduce GHG emissions by 5% below 1990 levels)
• COP15 (2009): Copenhagen — wealthy nations pledged USD 100 billion per year by 2020 for developing nations (pledged amount not fully met)
• COP21 (2015): Paris Agreement adopted — all 196 parties set their own NDCs
• COP26 (2021, Glasgow): India launched “Panchamrit” — 500 GW non-fossil fuel capacity, 50% energy from renewables by 2030, net-zero by 2070. Also endorsed the Glasgow Climate Pact.
• COP27 (2022, Sharm el-Sheikh, Egypt): Operationalised the Loss and Damage Fund for vulnerable nations
• COP28 (2023, Dubai/UAE): First Global Stocktake completed; agreement to “transition away” from fossil fuels (not “phase out” as originally proposed)
• COP29 (2024, Baku, Azerbaijan): Climate finance goals set at USD 300 billion per year by 2035

India’s position in climate negotiations emphasises “common but differentiated responsibilities” — developed nations bear primary historical responsibility for cumulative emissions, and developing nations need adequate finance and technology transfer to decarbonise.

Ramsar Sites and Wetland Conservation

India has 82 Ramsar sites (wetlands of international importance, designated under the Ramsar Convention, 1971, Tehran). Notable sites include: Dal Lake (Srinagar), Sukhna Lake (Chandigarh), Chilika Lake (Odisha — Asia’s largest brackish water lagoon), Bhitarkanika Mangroves (Odisha), Keoladeo National Park (Bharatpur, Rajasthan), and the Sundarbans (West Bengal — largest tidal mangrove forest in the world). Wetlands are critical for biodiversity, carbon sequestration, flood control, and groundwater recharge. India lost approximately 40% of its wetlands between 1900 and 2020.

Forest Cover and Tree Cover

India’s forest cover is approximately 21.71% of its total geographical area (Forest Survey of India, 2023), against the target of 33% under the National Forest Policy. The afforestation programme includes the Green India Mission (GIM), Compensatory Afforestation Fund (CAMPA), and various state-level programmes. The Forest (Conservation) Act, 1980 restricts the de-notification of forest land. India is also part of the Bonn Challenge — committed to restoring 21 million hectares of degraded forest land by 2030.

Wildlife Crime and Legal Framework

India’s wildlife protection framework includes the Wildlife (Protection) Act, 1972 (amended in 2022), the Biological Diversity Act, 2002, and the Environment Protection Act, 1986. The National Wildlife Crime Control Bureau (NWCCB) coordinates anti-poaching efforts. India banned single-use plastics (with some exemptions) in 2022. The Illegal Wildlife Trade Conference (Bangkok, 2023) addressed the illegal trade in pangolin, rhino horn, and big cats — India is a source and transit country for wildlife contraband.

Disaster Management and Climate Resilience

India’s disaster management framework includes the National Disaster Management Authority (NDMA, headed by the Prime Minister), State Disaster Management Authorities, and the National Disaster Response Force (NDRF, established in 2006, comprising 16 battalions). India faces multiple natural disasters: cyclones (especially in Odisha, Andhra Pradesh, West Bengal), floods (Bihar, Assam, Uttar Pradesh), earthquakes (Himalayan region, Gujarat, Maharashtra), landslides (Western Ghats, Himalayan foothills), and heatwaves (Rajgarh in MP recorded 51°C in 2022 — India’s highest recorded temperature).

SNAP-specific question patterns: SNAP Environment questions frequently ask about COP meeting locations and years, Ramsar site locations (especially within India), India’s climate commitments (net-zero 2070, Panchamrit), tiger population counts, and pollution indices for major cities. Pair the year 2023 with COP28 (Dubai), 2022 with COP27 (Sharm el-Sheikh), and 2021 with COP26 (Glasgow and India’s Panchamrit announcement).