UPSC Prelims 2026 Environment Revision — Day 5: Ecology, Protected Areas & Conventions

Time needed: 3–4 hours  |  High-yield rating: ⭐⭐⭐⭐⭐ (10–22 questions per paper in recent years)

Protected Areas — Key Numbers (Verified May 2026)

Prelims trap: India has 99 Ramsar sites (as of April 2026); TN has the most (20).

Prelims trap: Similipal became 107th National Park (not 106th) in April 2025.

Tiger Population & Project Tiger

• Project Tiger launched: April 1, 1973 — Jim Corbett NP, under PM Indira Gandhi; started with 9 reserves
• NTCA (National Tiger Conservation Authority) — established 2006 under Wildlife Protection Amendment Act
• Tiger population: 3,682 (range: 3,167–3,925) — All India Tiger Estimation 2022 (released 2023)
• 24% increase over 2018 count (2,967); India holds ~75% of world's wild tiger population
• State with most tigers: Madhya Pradesh (785); followed by Karnataka (563), Uttarakhand (560)

Forest Cover — ISFR 2023

Prelims trap: National Forest Policy 1988 targets 33% under forest/tree cover — India currently at 25.17% (not achieved).

Key Environmental Laws of India

Prelims trap: CPCB was established under the Water Act 1974 — NOT under EPA 1986.

Prelims trap: The Wildlife Protection Act 2022 amendment reduced schedules from 6 to 4. The FCA 1980 was renamed (not repealed) in 2023.

Wildlife Protection Act 1972 — Schedules After 2022 Amendment

The WPA 2022 Amendment rationalised from 6 to 4 Schedules:

Prelims trap: Schedule I provides absolute protection — highest penalty. The 2022 Amendment restructured schedules to align with CITES. Old Schedule V (vermin) and VI (plants) were merged or reorganised — the old 6-schedule structure is now superseded.

Species — IUCN Status (Critical & Key)

Critically Endangered in India

Other Key IUCN Statuses

Prelims trap: Gangetic River Dolphin is Endangered (EN) — NOT Critically Endangered. Indian Rhinoceros is Vulnerable (VU) — NOT Endangered.

Prelims trap: Indian Wolf is Vulnerable (IUCN 2025) but Endangered under India's WPA — IUCN global and India's domestic classifications don't always match.

Key International Environmental Conventions

Prelims trap: Basel, Rotterdam, and Stockholm = "BRS Conventions" — shared secretariat, back-to-back COPs. Basel = waste, Rotterdam = chemicals/pesticides trade, Stockholm = POPs.

Prelims trap: Kigali Amendment (2016) targets HFCs — these do NOT deplete ozone (they replaced CFCs) but have very high global warming potential. India ratified Kigali September 2021.

Ozone Layer & Montreal Protocol — Key Facts

Ozone Layer Basics

• Location: Stratosphere — mainly 15–35 km altitude
• Function: Absorbs UV-B radiation — causes skin cancer, cataracts, crop damage, harm to marine ecosystems
• "Good ozone" (stratosphere) vs "Bad ozone" (troposphere — ground-level ozone = smog component, a health hazard)

How CFCs Destroy Ozone

• UV radiation breaks CFCs in the upper stratosphere, releasing chlorine (Cl) atoms
• Each Cl atom destroys approximately 100,000 ozone molecules via catalytic chain reaction
• Chlorine is regenerated and continues destroying ozone — it is not consumed

Antarctic Ozone Hole

• Largest depletion over Antarctica, primarily in September–October (southern spring)
• Caused by Polar Stratospheric Clouds (PSCs) — form in extreme cold; accelerate chlorine-mediated destruction when spring UV arrives
• 2025 ozone hole: 5th smallest since 1992 (NOAA-NASA), showing gradual recovery

Montreal Protocol & Kigali Amendment — Key Dates

Prelims trap: World Ozone Day = September 16 — date Montreal Protocol was signed in 1987 (NOT the Vienna Convention).

Prelims trap: HFCs are NOT ozone-depleting — introduced as CFC replacements precisely because they don't harm ozone. But HFCs are potent greenhouse gases — why Kigali Amendment targets them.

Prelims trap: Montreal Protocol = only UN treaty ratified by every country (198 parties = 197 states + EU).

Biodiversity — Key Laws & Agreements

CITES (Convention on International Trade in Endangered Species)

Prelims trap: Appendix III listings can be done unilaterally by any CITES party; Appendix I and II require CoP decision (all parties).

Convention on Biological Diversity (CBD)

• Adopted: 1992 (Rio Earth Summit); Entered into force: 1993
• 3 objectives: Conservation of biodiversity; sustainable use; fair and equitable sharing of benefits
• Cartagena Protocol: January 29, 2000 — on biosafety; Living Modified Organisms (LMOs/GMOs); entered into force September 11, 2003
• Nagoya Protocol: October 29, 2010 — on Access and Benefit Sharing (ABS) from genetic resources; in force October 12, 2014
• Kunming-Montreal Global Biodiversity Framework (GBF): Adopted at CBD COP15 (December 2022); "30×30 target" — protect 30% of land and oceans by 2030

Ramsar Convention

• Official name: Convention on Wetlands of International Importance especially as Waterfowl Habitat
• Signed: 1971 at Ramsar, Iran; Entered into force: 1975
• India's 1st Ramsar sites: Chilika Lake + Keoladeo Ghana (both designated October 1, 1981); India ratified: 1982
• Montreux Record: Indian sites on it — Keoladeo Ghana, Loktak Lake (concerning conservation status)

UNESCO Man and Biosphere (MAB) Programme

• Launched: 1971 by UNESCO
• Three-zone structure of every Biosphere Reserve:
  • Core Zone: Strictly protected; biodiversity conservation; research only
  • Buffer Zone: Surrounds core; limited research, education, tourism permitted
  • Transition Zone (Cooperation Zone): Human settlements, farming, sustainable activities allowed
• India: 18 nationally notified Biosphere Reserves; 13 recognized by UNESCO WNBR (13th: Cold Desert, HP — September 2025)

Prelims trap: India has 18 national Biosphere Reserves but only 13 UNESCO-recognized ones. Both numbers are tested.

Biodiversity Hotspots in India

India has 4 of the 36 global biodiversity hotspots (Conservation International):

India's biodiversity by numbers: ~6–7% world's plant species; ~6.4% mammals; ~12% birds; ~6.2% amphibians.

Prelims trap: India has 4 hotspots — not 2 or 3. Western Ghats and Sri Lanka are ONE combined hotspot (not two). Sundaland is often omitted because India's portion is only the Nicobar Islands.

Prelims trap: Hoolock Gibbon (Assam, Arunachal) = India's only ape; found in Indo-Burma hotspot (NOT Western Ghats).

Climate Change — Agreements, NDC & Panchamrit

International Agreements

COP sequence (recent): COP28 = Dubai, UAE (2023); COP29 = Baku, Azerbaijan (2024) — NCQG agreed ($300 bn/year climate finance); COP30 = Belém, Brazil (November 2025).

India's Updated NDC (formally submitted 2022)

• Reduce emissions intensity of GDP by 45% from 2005 levels by 2030
• Achieve 50% of cumulative electric capacity from non-fossil fuels by 2030
• Create additional carbon sink of 2.5–3 billion tonnes CO₂ equivalent through forest/tree cover by 2030

Panchamrit — India's 5 Climate Targets (COP26, Glasgow, November 2021)

LiFE Mission (Lifestyle for Environment)

• Launched: PM Modi at COP26, November 2021
• Concept: Promotes pro-planet individual behaviour — "Pro-Planet People" (P3)
• Counters western throw-away consumerism; draws on India's tradition of living in harmony with nature

Prelims trap: India's Net Zero target is 2070 — NOT 2050 or 2060. Panchamrit = 5 elements (not 4 or 6). The 4th element (emissions intensity -45%) was upgraded from 33–35% in Updated NDC 2022.

Prelims trap: LiFE was launched at COP26 (2021) — "Pro-Planet People" (P3) is the tagline.

Renewable Energy Numbers (Verified May 2026)

Record: FY2025-26 — 45 GW solar added in a single year — highest ever.

India achieved 50% non-fossil installed capacity in June 2025 — 5 years ahead of the NDC 2030 target.

National Missions on Environment (NAPCC — 2008)

Launched: June 30, 2008 — 8 National Missions under National Action Plan on Climate Change:

Prelims trap: NAPCC has 8 missions — not 7 or 9. All launched June 30, 2008.

Prelims trap: PAT scheme falls under NMEEE (Mission 2) — NOT the Solar Mission (Mission 1). PAT uses market-based mechanisms for energy efficiency in energy-intensive industries.

Air Pollution — Key Standards & Bodies

CPCB and Air Quality Standards

• CPCB: Established under Section 3 of the Water Act, 1974 — NOT under EPA 1986. Under MoEFCC. Issues NAAQS (National Ambient Air Quality Standards).
• NAAQS: First issued 1982; last significantly revised November 18, 2009. Currently covers 12 pollutants (PM2.5, PM10, NO₂, SO₂, CO, O₃, NH₃, Pb, benzene, arsenic, nickel, benzo(a)pyrene).
• Key limits (annual mean): PM2.5 = 40 μg/m³; PM10 = 60 μg/m³

India's Air Quality Index (AQI) — 6 Categories

• 8 Pollutants measured: PM2.5, PM10, NO₂, SO₂, CO, O₃, NH₃, Pb (lead)
• Introduced: 2014 by CPCB; minimum 3 pollutants needed; one must be PM2.5 or PM10

National Clean Air Programme (NCAP)

• Launched: January 2019 by MoEFCC
• Cities covered: 131 non-attainment cities across 24 States/UTs
• Target: 40% reduction in PM₁₀ or meeting PM₁₀ NAAQS by 2025–26 (from 2017 baseline)

GRAP — Graded Response Action Plan (Delhi-NCR)

• Implemented by: CAQM (Commission for Air Quality Management in NCR and Adjoining Areas)
• CAQM: Established via Ordinance in 2020; became statutory under CAQM Act, 2021 (April 13, 2021); replaced EPCA (non-statutory Supreme Court body set up 1998)

Prelims trap: CPCB established under Water Act 1974 — NOT EPA 1986. CAQM (not EPCA) is the current statutory body for Delhi-NCR air quality — EPCA lacked statutory backing.

Water Pollution & Rivers

Namami Gange Programme

• Nodal body: National Mission for Clean Ganga (NMCG) under Ministry of Jal Shakti
• Launched: May 2015 (approved June 2014); budget ₹20,000 crore
• Objectives: Pollution abatement; conservation; rejuvenation; STPs; river surface cleaning; biodiversity conservation

Ganga Action Plans — Historical Context

Water Pollution — Key Concepts

• BOD (Biological Oxygen Demand): Amount of dissolved oxygen consumed by biological processes; higher BOD = more polluted; dissolved oxygen (DO) drops — inverse relationship
• CPCB River Classification: 5 categories — A (drinking after conventional treatment), B (bathing), C (drinking after advanced treatment), D (wildlife/fisheries), E (irrigation/industrial — most degraded)
• Yamuna: ~22 km Delhi stretch (Wazirabad to Okhla) carries ~80% of Yamuna's total pollution load; 52 drains discharge directly into Yamuna in Delhi

Prelims trap: Namami Gange launched 2015 with ₹20,000 crore; GAP I launched 1985 by Rajiv Gandhi. NMCG is under Ministry of Jal Shakti (not Environment Ministry).

Important National Parks — Location by State

Prelims trap: Gir Forest = world's only habitat of the Asiatic Lion (NOT African lion). Hemis NP = India's largest National Park by area (not Kaziranga or Sundarbans).

Coral Reefs in India

India has four major coral reef regions — all fringing reefs except Lakshadweep which are atolls:

Prelims trap: Lakshadweep corals are atolls — DIFFERENT from fringing or barrier reefs. Gulf of Kutch = among world's most northerly coral reefs.

Agricultural Revolutions in India

Prelims trap: Green Revolution most successful in Punjab, Haryana, and western UP — NOT all of India. M.S. Swaminathan = "Father of Green Revolution in India"; Norman Borlaug = "Father of Green Revolution globally" (Nobel Prize 1970).

Prelims trap: Operation Flood (White Revolution) ran three phases: 1970–80, 1981–85, 1985–96 — world's largest dairy development programme.

Ecology Basics — Frequently Tested Concepts

Lindemann's 10% Energy Law (1942)

• Proposed by: Raymond Lindemann (1942)
• Law: Only about 10% of energy at one trophic level transfers to the next; ~90% lost as heat, undigested matter, metabolic processes
• Example: 1,000 kcal plants → 100 kcal herbivores → 10 kcal primary carnivores → 1 kcal secondary carnivores
• Implication: Food chains rarely exceed 4–5 trophic levels

Food chain vs food web:

• Food chain: Linear sequence (grass → deer → tiger)
• Food web: Interconnected network — more realistic; more stable (alternative energy pathways)

Ecological Pyramids — Key Distinction

Prelims trap: Pyramid of energy is ALWAYS upright — can NEVER be inverted. The classic inverted biomass example is aquatic ecosystems (phytoplankton). Lindemann proposed the 10% law in 1942 — year tested directly.

Biogeochemical Cycles — Tested Steps

Nitrogen Cycle:

Prelims trap: Rhizobium fixes nitrogen only in legume root nodules (symbiotic); Azotobacter is free-living. Nitrosomonas = Step 1 of nitrification; Nitrobacter = Step 2. Pseudomonas = key denitrifying bacterium.

Carbon Cycle — Key Processes:

• Photosynthesis: CO₂ + H₂O → glucose + O₂ (fixes carbon)
• Respiration: Glucose + O₂ → CO₂ + H₂O (returns carbon to atmosphere)
• Oceans as carbon sink: ~25–30% of anthropogenic CO₂ absorbed → causes ocean acidification

Ecological Succession

• Climax community: Relatively stable end-state; species composition in equilibrium with local climate
• Seral community / Sere: Each intermediate stage of succession before climax

Keystone Species, Edge Effect, Ecotone

• Keystone species: Disproportionately large impact relative to abundance; removal causes dramatic restructuring. Examples: sea otters (control sea urchins → protect kelp forests); elephants (ecosystem engineers)
• Ecotone: Transition zone between two ecosystems. Examples: mangrove forests, riverbanks, wetland edges
• Edge effect: Ecotone areas tend to have higher species diversity than either adjacent ecosystem (more resources, structural variety, more niches)

r-strategists vs K-strategists:

Protected Areas — Nuances and Differences

National Park vs Wildlife Sanctuary vs Conservation Reserve vs Community Reserve

Prelims trap: Only National Park boundary change requires an Act of the State Legislature — not a Wildlife Sanctuary. Sanctuary can be altered by notification.

Prelims trap: Conservation Reserves = government-owned uninhabited land; Community Reserves = private or community-owned land where owners voluntarily agree to conserve.

Critical Tiger Habitat (CTH) vs Buffer Zone

• Legal basis: Section 38V of the Wildlife Protection Act 1972 (inserted by 2006 amendment)
• CTH (Core area): Inviolate; no human activity; notified by State Government based on expert criteria
• Buffer Zone: Peripheral area; allows co-existence of wildlife and human activity; recognises livelihood rights
• Distinction: CTH/buffer are Tiger Reserve zones under WPA; Biosphere Reserve core/buffer/transition zones are UNESCO MAB designations — different legal frameworks

Important International Environmental Days

Prelims trap: World Wildlife Day = March 3 — same date CITES was signed in 1973. World Ozone Day = September 16 — date the Montreal Protocol was signed in 1987, NOT the Vienna Convention.

Important Reports & Indices

2025–26 Current Affairs: Environment & Ecology

Protected Areas — New Additions (2025–26)

Prelims trap: India's 99th Ramsar site = Shekha Jheel Bird Sanctuary (Aligarh, UP), designated April 22, 2026 (Earth Day).

Prelims trap: 13th UNESCO Biosphere Reserve = Cold Desert (HP), designated September 2025. India has 18 nationally notified but only 13 have UNESCO recognition.

Climate — COP30 Belém, Brazil (November 2025)

Prelims trap: COP29 = Baku, Azerbaijan (2024) — NCQG of $300 billion/year agreed. COP30 = Belém, Brazil (2025). COP28 = Dubai, UAE (2023).

Renewable Energy Milestones (2025–26)

Green Hydrogen & New Environmental Policies

Prelims trap: National Green Hydrogen Mission total outlay = ₹19,744 crore; SIGHT programme = ₹17,490 crore (single largest component). Target: 5 million tonnes green hydrogen/year by 2030.

IUCN World Conservation Congress 2025

Prelims trap: IUCN Congress (2025) = Abu Dhabi, UAE — NOT a UN body (IUCN is an international NGO/union). IUCN Congress held every 4 years.