The Convention on Biological Diversity (CBD) was opened for signature at the Earth Summit in Rio de Janeiro in 1992 and entered into force in 1993. It has three main objectives: conservation of biodiversity, sustainable use of its components, and fair and equitable sharing of benefits arising from genetic resources. India is a party to the CBD.

Carbon Dioxide (CO₂) is the primary greenhouse gas contributing to anthropogenic climate change, accounting for approximately 76% of global greenhouse gas emissions. It comes from burning fossil fuels, deforestation, and industrial processes. CO₂ has a long atmospheric lifetime (hundreds to thousands of years), making it the most significant long-term driver of climate change.

Jim Corbett National Park was established in 1936 as Hailey National Park, named after William Malcolm Hailey, the Governor of the United Provinces. It was renamed Ramganga National Park in 1952, and finally Jim Corbett National Park in 1957 in honor of Jim Corbett, the renowned hunter-turned-conservationist. It is located in Uttarakhand and was the first park to come under Project Tiger in 1973.

The Great Pacific Garbage Patch is primarily composed of micro and macro plastics — largely microplastics (fragments smaller than 5mm) that result from the breakdown of larger plastic items. It is located in the North Pacific Ocean between Hawaii and California. It is not a solid island of trash but rather a high concentration of plastic particles in the water column, estimated to cover 1.6 million sq km.

The Paris Agreement (2015) aims to limit global average temperature increase to well below 2°C above pre-industrial levels, while pursuing efforts to limit the increase to 1.5°C. India ratified the Paris Agreement in October 2016. The agreement replaced the Kyoto Protocol and is legally binding, though NDCs (Nationally Determined Contributions) are voluntary. India committed to achieving 500 GW of non-fossil fuel capacity by 2030.

The Ramsar Convention on Wetlands (1971) designates Wetlands of International Importance based on ecological, botanical, zoological, limnological, or hydrological significance. A wetland qualifies if it meets any of the 9 Ramsar criteria, including supporting vulnerable/endangered species, being a significant habitat for fish breeding, or playing a role in water regulation. India has the highest number of Ramsar sites in South Asia.

The Western Ghats & Sri Lanka biodiversity hotspot is one of the world’s 36 recognized hotspots. It spans the Western Ghats mountain chain of India and the island of Sri Lanka. To qualify as a hotspot, a region must have at least 1,500 endemic vascular plant species and have lost at least 70% of its original vegetation. India has 4 biodiversity hotspots: Western Ghats & Sri Lanka, Himalayas, Indo-Burma, and Sundaland.

India’s National AQI considers 8 major pollutants: PM2.5, PM10, NO₂, SO₂, CO, O₃ (Ozone), NH₃ (Ammonia), and Pb (Lead). The AQI was launched by the Ministry of Environment, Forest and Climate Change in 2014 under the Swachh Bharat Mission. The AQI scale ranges from 0 to 500, with categories from Good (0-50) to Severe (401-500).

India’s National Forest Policy 1988 recommends maintaining 33% of the total land area under forest and tree cover for maintaining ecological stability. For hilly and mountainous regions, the target is 66%. Currently, India’s forest and tree cover is approximately 24.62% of the geographical area (State of Forest Report 2021). The government aims to achieve the 33% target through afforestation and reforestation programs.

According to the Tiger Census 2022, India has approximately 3,167 tigers, which represents about 70% of the world’s total wild tiger population. Project Tiger was launched in 1973 with 9 reserves. Currently, India has 53 Tiger Reserves covering about 75,000 sq km. The 2022 census showed significant growth from 1,411 tigers in 2006, making India a global success story in tiger conservation.

The Hindon River, a tributary of the Yamuna, is considered one of the most polluted rivers and passes through Delhi receiving significant untreated sewage. However, in terms of the Yamuna itself, it receives about 80% of Delhi’s sewage. The Sabarmati and Cooum rivers are also heavily polluted. The National Green Tribunal (NGT) has repeatedly issued orders to clean up these rivers. The Namami Gange programme focuses on Ganga river cleanup.

Under the Kyoto Protocol, Annex B countries (developed nations and economies in transition) had legally binding emission reduction targets for the first commitment period (2008-2012). Annex I countries under UNFCCC are industrialized nations. The Kyoto Protocol operated on the principle of “common but differentiated responsibilities” (CBDR). India and China, as developing countries, were not included in Annex B and had no binding targets under Kyoto.

The Millennium Ecosystem Assessment (2005) classified ecosystem services into four categories: (1) Provisioning services — food, water, timber; (2) Regulating services — climate regulation, flood control; (3) Cultural services — recreation, spiritual value; (4) Supporting services — nutrient cycling, soil formation. “Manufacturing services” is not a category. These services have enormous economic value — globally estimated at $125-145 trillion per year.

Reducing water use at source (demand-side management) is the most effective approach to water conservation as it prevents wastage before it occurs. Drip irrigation can save 30-50% of water compared to flood irrigation. Rainwater harvesting supplements groundwater. Watershed management addresses larger catchment areas. India faces water stress with per capita availability declining from 5,177 m³ (1951) to ~1,486 m³ (2021). The National Water Mission targets 20% increase in water use efficiency.

Eutrophication is the process by which a water body becomes enriched with dissolved nutrients (mainly nitrogen and phosphorus from agricultural runoff, sewage), stimulating excessive algal growth (algal blooms). When algae die, decomposition by bacteria consumes dissolved oxygen, creating hypoxic (low oxygen) or anoxic “dead zones.” This kills fish and other aquatic life. Lake Erie in USA and Chilika Lake in India have experienced eutrophication.

Tropical Moist Deciduous Forests are the most extensive forest type in India, found in areas receiving 100-200 cm annual rainfall. They cover about 37% of India’s forest area. Major trees include Sal (Shorea robusta) in northern India and Teak (Tectona grandis) in peninsular India. They are found in states like Odisha, Jharkhand, Chhattisgarh, Madhya Pradesh, and parts of Western Ghats.

Kerala became the first Indian state to declare a Climate Emergency in December 2020 (formal declaration in 2021). This came in the wake of devastating floods in 2018 and 2019. Kerala’s State Action Plan on Climate Change focuses on increasing renewable energy, sustainable agriculture, and coastal conservation. Kerala has also developed a comprehensive “Kerala Perspective Plan 2030” addressing climate risks.

The Nilgiri Biosphere Reserve was the first biosphere reserve in India (established 1986) and was also the first Indian reserve to be included in UNESCO’s World Network of Biosphere Reserves in 2000. India has 18 biosphere reserves in total, of which 12 have been recognized by UNESCO. The Sundarbans is shared between India and Bangladesh and is included in UNESCO’s network.

The Bhopal Gas Tragedy on December 2-3, 1984, was caused by the leakage of Methyl Isocyanate (MIC) gas from the Union Carbide Corporation pesticide plant in Bhopal. It is considered the world’s worst industrial disaster. Approximately 500,000 people were exposed; official death toll was 3,787, though actual estimates range up to 16,000-22,000. The disaster led to India’s Environment Protection Act 1986 and improved industrial safety regulations.

Chlorofluorocarbons (CFCs) were the primary ozone-depleting substances addressed by the Montreal Protocol. CFCs were used in refrigerators, air conditioners, aerosol sprays, and foam production. In the stratosphere, UV radiation breaks down CFCs, releasing chlorine atoms that catalytically destroy ozone molecules. One chlorine atom can destroy thousands of ozone molecules. The Montreal Protocol is considered the most successful environmental treaty, having phased out 98% of ozone-depleting substances.

Contour ploughing (ploughing along the contour lines, perpendicular to the slope) combined with terracing is the most effective practice for preventing soil erosion on steep slopes. Terracing creates flat or nearly flat surfaces on hillsides, reducing the length and steepness of slopes. This significantly slows water runoff, reduces erosion, and conserves moisture. The Chipko Movement in Uttarakhand highlighted the importance of forests and vegetation in preventing soil erosion.

The IPCC was established in 1988 jointly by the United Nations Environment Programme (UNEP) and the World Meteorological Organization (WMO). It does not conduct original research but synthesizes existing climate science for policymakers. The AR6 report (2021-2022) stated that climate change is “unequivocal” and human influence is the principal cause of warming observed since the 1950s. The IPCC shared the Nobel Peace Prize in 2007 with Al Gore.

Under the Wildlife Protection Act 1972, National Parks have the highest level of protection — no human activity (grazing, forestry, or habitation) is permitted. Wildlife Sanctuaries allow some human activities like limited grazing and collection of forest produce. Both are protected areas, but NPs have stricter inviolability. The boundaries of a National Park can only be changed by a state legislature, while a Sanctuary’s boundaries can be changed by the state government.

The Species-Area Relationship (SAR), formulated by MacArthur and Wilson (1967) in their Theory of Island Biogeography, predicts that larger areas support more species due to: (1) greater habitat diversity, (2) more resources supporting larger populations, and (3) lower extinction rates for species with larger populations. The theory states that doubling the area roughly increases species number by about 20-30%. This principle is applied in designing nature reserves — larger and connected reserves support more biodiversity.

Photochemical smog (also called Los Angeles-type smog) is formed when nitrogen oxides (NOₓ) and Volatile Organic Compounds (VOCs) from vehicle exhausts and industrial emissions react in the presence of sunlight (UV radiation). This produces secondary pollutants including ground-level ozone, peroxyacetyl nitrate (PAN), and aldehydes. It reduces visibility, irritates eyes and respiratory system, and damages crops. Delhi and other Indian cities frequently experience photochemical smog.

Chilika Lake is located in Odisha, India. It is Asia’s largest brackish water lagoon and India’s largest coastal lagoon, spanning about 1,100 sq km. It was designated as India’s first Ramsar site in 1981. Chilika is famous for its migratory birds (including flamingos), Irrawaddy dolphins, and rich fisheries. It supports the livelihoods of over 200,000 fishing families. The lake was under ecological stress due to eutrophication but has recovered significantly.

E-waste (electronic waste) refers to discarded electrical and electronic equipment (EEE) including computers, mobile phones, TVs, refrigerators, and other appliances. E-waste contains toxic substances like lead, mercury, cadmium, chromium, and PBDEs (polybrominated diphenyl ethers). India generates about 3.2 million tonnes of e-waste annually (3rd largest globally). The E-Waste (Management) Rules 2016 mandate Extended Producer Responsibility (EPR) in India.

The Clean Development Mechanism (CDM) under the Kyoto Protocol allows developed countries (Annex I) to invest in emission reduction projects in developing countries (non-Annex I) and earn Certified Emission Reductions (CERs) — one CER equals one tonne of CO₂ equivalent. Developing countries benefit from foreign investment and technology transfer. India was one of the largest CDM host countries. Joint Implementation (JI) is between Annex I countries.

Bioprospecting refers to the systematic search for and commercial development of biological resources (plants, animals, microorganisms) for pharmaceutical, agricultural, or industrial uses. It becomes problematic when companies from developed nations extract genetic resources from biodiverse developing countries without adequate compensation or benefit sharing — often called “biopiracy.” The Nagoya Protocol (2010) under CBD addresses Access and Benefit Sharing (ABS). India has the Biological Diversity Act 2002 to regulate bioprospecting.

The Environment (Protection) Act 1986 was enacted by the Indian Parliament in the wake of the Bhopal Gas Tragedy (December 1984). It is an umbrella legislation that provides powers to the central government to protect and improve environmental quality. It empowers the government to establish standards for quality, regulate/restrict operations, inspect industries, and impose penalties. The Act led to the establishment of the Ministry of Environment & Forests in 1985 and gave teeth to environmental enforcement.

The IUCN Red List of Threatened Species is the world’s most comprehensive inventory of the global conservation status of biological species. It is maintained by the International Union for Conservation of Nature (IUCN), founded in 1948. Species are categorized as: Extinct (EX), Extinct in the Wild (EW), Critically Endangered (CR), Endangered (EN), Vulnerable (VU), Near Threatened (NT), Least Concern (LC), and Data Deficient (DD). India’s Bengal Tiger is Endangered; Snow Leopard is Vulnerable.

The Forest Rights Act (FRA) 2006 recognizes and vests forest rights in forest-dwelling Scheduled Tribes and Other Traditional Forest Dwellers (OTFDs) over two types of land: (1) Individual Forest Rights (IFR) — on land occupied and cultivated by individuals; (2) Community Forest Rights (CFR) — over community forest resources including water bodies, grazing lands, and minor forest produce. The Act also grants rights to convert forest villages to revenue villages.

Carbon sequestration is the process of capturing and storing atmospheric CO₂ to mitigate climate change. Tropical forests are among the most effective terrestrial carbon sinks. However, “blue carbon” ecosystems (mangroves, seagrasses, salt marshes) sequester carbon at rates 3-5 times higher than tropical forests per unit area — and store it for thousands of years. India’s mangroves cover ~4,992 sq km. The National Action Plan on Climate Change (NAPCC) includes the Green India Mission targeting 10 million hectares of forest.

Fly ash is the fine particulate residue (mainly silica, alumina, iron oxide, calcium oxide) generated from burning coal in thermal power plants. India generates about 200-250 million tonnes of fly ash annually — the second largest in the world after China. Coal-based thermal power plants account for ~70% of India’s electricity. Fly ash can contaminate groundwater and soil. However, it can also be used productively in cement, bricks, road construction, and mine filling. MOEF has mandated 100% fly ash utilization.

CITES Appendix I includes species threatened with extinction — commercial trade in these species is generally prohibited. Currently ~1,000 species are in Appendix I, including tigers, leopards, elephants, and some orchids. Appendix II includes species not necessarily threatened with extinction but whose trade must be controlled (e.g., most sea turtles). Appendix III includes species protected in at least one country. India is a Party to CITES. The Snow Leopard, Indian Elephant, and Great Indian Bustard are in Appendix I.

The National Solar Mission (NSM) is one of the eight missions under India’s National Action Plan on Climate Change (NAPCC), launched in 2008. The other seven missions are: National Mission for Enhanced Energy Efficiency, National Water Mission, National Mission for Sustainable Habitat, National Mission for Sustaining the Himalayan Ecosystem, Green India Mission, National Mission for Sustainable Agriculture, and National Mission for Strategic Knowledge for Climate Change. NSM target is 100 GW solar by 2022 (revised), now aiming 500 GW non-fossil by 2030.

Desertification is the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture. It is a major global environmental problem, affecting about 33% of Earth’s land surface. India has about 96.4 million hectares of degraded land (approximately 29% of its total area). The UN Convention to Combat Desertification (UNCCD, 1994) addresses this issue. Rajasthan’s Thar Desert is expanding due to anthropogenic pressures. India has committed to restoring 26 million hectares of degraded land by 2030.

The Sixth Mass Extinction (also called the Holocene or Anthropocene extinction) refers to the ongoing extinction event primarily caused by human activities. Scientists estimate that species are currently going extinct at 100-1,000 times the natural background rate. Primary drivers include: (1) habitat loss and fragmentation (largest driver), (2) overexploitation (hunting, fishing), (3) invasive species, (4) pollution, (5) climate change. The previous five mass extinctions (including the one that killed dinosaurs 66 million years ago) were caused by natural events.

Acid rain is primarily caused by emissions of Sulfur Dioxide (SO₂) and Nitrogen Oxides (NOₓ) from thermal power plants, industries, and vehicles. These gases react with water vapor in the atmosphere to form sulfuric acid and nitric acid, which fall as acid rain. Normal (clean) rainwater has a pH of about 5.6 (slightly acidic due to dissolved CO₂ forming carbonic acid). Acid rain has pH below 5.6, sometimes as low as 2-3. It damages forests, lakes, and buildings (especially limestone/marble structures like the Taj Mahal).

Kaziranga National Park is located in Assam, India. It is a UNESCO World Heritage Site and is home to about 2/3 of the world’s one-horned rhinoceros population (over 2,600 rhinos as of 2022). It also has the highest density of Bengal Tigers among protected areas and significant populations of wild water buffalo, elephants, and swamp deer. Kaziranga spans the floodplains of the Brahmaputra River. It was established as a reserve forest in 1905 and became a National Park in 1974.

The National Green Tribunal (NGT) Act 2010 established the NGT for effective and expeditious disposal of cases relating to environmental protection and conservation of forests and other natural resources, including enforcement of legal rights relating to environment. It deals with civil cases only (not criminal). It has a multi-disciplinary bench including judicial and expert members. The NGT has powers of a civil court and can award compensation for environmental damage. It operates from New Delhi with circuit benches in Bhopal, Pune, Kolkata, and Chennai.

In-situ conservation means protecting species in their natural habitat (e.g., national parks, wildlife sanctuaries, biosphere reserves). Ex-situ conservation involves maintaining species outside their natural habitats, including: (1) Gene/seed banks — Svalbard Global Seed Vault, National Bureau of Plant Genetic Resources (NBPGR) in India; (2) Zoos; (3) Botanical gardens; (4) In-vitro techniques. Gene banks store genetic material for future use. Both approaches are complementary — in-situ is preferred but ex-situ serves as a backup.

The Ganga Action Plan (GAP) was launched in 1985 under PM Rajiv Gandhi’s government. It was the first river action plan in India, aiming to reduce pollution in the Ganga by intercepting, diverting, and treating municipal sewage. GAP Phase I (1986-1993) covered Varanasi, Allahabad, and Patna. GAP Phase II extended to tributaries. However, GAP largely failed to achieve its objectives due to poor planning and maintenance. The Namami Gange Programme (2014) with ₹20,000 crore budget replaced it with an Integrated Conservation Mission approach.

Nationally Determined Contributions (NDCs) are climate action plans that countries voluntarily submit under the Paris Agreement, detailing how each country will reduce greenhouse gas emissions and adapt to climate change impacts. They are updated every 5 years and are supposed to become progressively more ambitious (“ratchet mechanism”). India’s updated NDC (2022) includes: reduce emission intensity by 45% of 2005 levels by 2030, achieve 50% non-fossil electricity by 2030, and create carbon sink of 2.5-3 billion tonnes through forests.

The Biological Diversity Act (BDA) 2002 was enacted to give effect to the Convention on Biological Diversity and deals with Access and Benefit Sharing (ABS) of biological resources. The Act established: National Biodiversity Authority (NBA) at national level, State Biodiversity Boards (SBBs) at state level, and Biodiversity Management Committees (BMCs) at local level. It regulates access to biological resources by foreign nationals/companies and ensures fair sharing of benefits with local communities.

West Bengal has the largest mangrove cover in India, primarily due to the Sundarbans — the world’s largest mangrove forest, shared between India and Bangladesh. The Indian Sundarbans covers about 4,267 sq km. India’s total mangrove cover is approximately 4,992 sq km (as per State of Forest Report 2021). Mangroves are ecologically crucial — they protect coastlines from erosion, serve as nurseries for fish, sequester carbon, and provide habitat for tigers (Sundarbans Royal Bengal Tiger).

Biomagnification (also called bioaccumulation in food chains) is the increasing concentration of a substance (usually a persistent toxic chemical like DDT, mercury, PCBs) in tissues of organisms at successively higher trophic levels of a food chain. This happens because organisms at higher trophic levels consume many organisms from lower levels, accumulating more toxins over their lifetime. Classic example: DDT concentration was 0.000003 ppm in water → 0.04 ppm in zooplankton → 0.5 ppm in small fish → 2 ppm in large fish → 25 ppm in fish-eating birds.

The Urban Heat Island (UHI) effect refers to metropolitan areas being significantly warmer than surrounding rural areas. Primary causes: (1) Replacement of natural vegetation with heat-absorbing concrete, asphalt, and buildings; (2) Reduced evapotranspiration due to lack of vegetation; (3) Waste heat from vehicles, ACs, and industries; (4) Air pollution trapping heat. UHI can increase urban temperatures by 1-7°C compared to rural areas. Indian cities like Delhi, Mumbai, and Bangalore experience significant UHI effects. Solutions include green roofs, urban forests, and cool pavement technologies.

As per the National Water Policy 2012, the priority order for water allocation is: (1) Drinking water & sanitation, (2) Ecosystem needs (maintaining minimum environmental flows), (3) Agriculture (irrigation), (4) Industrial uses, (5) Navigation, hydropower, and others. This reflects a shift from purely anthropocentric to ecocentric priorities. The policy emphasizes treating water as an economic good, demand management, and integrated water resources management (IWRM).

The statement “India has 0 Endemic species of flowering plants” is INCORRECT. India actually has approximately 33% of its flowering plant species as endemics — about 4,900 endemic species. India is one of 17 recognized megadiverse countries, containing approximately 7-8% of all recorded species with only 2.4% of global land area. India spans two major biogeographic realms: the Indomalayan realm and the Palearctic realm. India has 4 biodiversity hotspots and is a global center of crop diversity.