Natural Vegetation and Wildlife

UPSC GS1/GS3 — Tropical Rainforests:

Location: Amazon Basin (South America), Congo Basin (Africa), Southeast Asia (Indonesia, Malaysia, Borneo) — between the Tropics of Cancer and Capricorn.

Climate: High temperature (~25–28°C year-round), very high rainfall (>2,000 mm/year), high humidity. No distinct seasons.

Structure (canopy layers):

• Emergent layer (30–50 m): Tallest trees poking above the main canopy
• Canopy layer (20–30 m): Dense layer blocking 95% of sunlight
• Understory: Shade-tolerant smaller trees; orchids, ferns
• Forest floor: Very dark; decomposers recycle nutrients quickly; surprisingly thin soil (nutrients in the biomass, not the soil)

Biodiversity: Tropical rainforests cover only ~6% of Earth's land surface but contain ~50–70% of all species on Earth. Amazon = most biodiverse ecosystem.

Amazon Rainforest:

• ~5.5 million km² (slightly larger than India's land area); 60% in Brazil
• Produces ~20% of Earth's oxygen (though it also consumes similar amounts — net exchange with atmosphere is near zero; role is more important in carbon storage and water cycle)
• Deforestation rate: Brazil loses ~10,000–15,000 km²/year to agriculture and cattle ranching (rate varies by government policy)
• Indigenous peoples: ~400 distinct groups live in the Amazon basin

Congo Rainforest (Africa):

• Second largest tropical rainforest (~3.3 million km²)
• DRC (Democratic Republic of Congo) contains most of it
• Gorillas, okapi, forest elephants

UPSC GS3 — India's Biodiversity:

India's biodiversity status:

• India = one of 17 megadiverse countries (countries with >70% of world's species)
• India has only 2.4% of world's land but 7–8% of world's species
• Endemic species: ~33% of India's flowering plants are endemic (found nowhere else)

Biodiversity Hotspots in India (4 of world's 36):

1. Western Ghats + Sri Lanka Hotspot: ~30 endemic amphibian species; rich endemic plant life; severe threat from agriculture and urbanisation
2. Indo-Burma Hotspot: Covers NE India (Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Tripura) + Myanmar, Indo-China; extremely rich in freshwater fish, amphibians, reptiles
3. Himalaya Hotspot: Covers the Himalayas (India, Bhutan, Nepal, Pakistan); includes rich alpine flora and fauna
4. Sundaland Hotspot: Covers Andaman & Nicobar Islands (India's portion); plus Indonesia, Malaysia, Brunei; high marine and terrestrial endemism

Forest cover (India State of Forest Report 2023):

• Total forest + tree cover: 8,27,357 sq km (25.17% of India's land area)
• Dense forest (>70% canopy): ~99,779 sq km
• Moderate forest (40–70% canopy): ~3,06,890 sq km
• Open forest (10–40% canopy): ~4,10,336 sq km
• Carbon stock in forests: ~7.2 billion tonnes (CO₂ equivalent ~28.6 billion tonnes)

Top forest cover states (area): Madhya Pradesh (largest forest area), Arunachal Pradesh, Chhattisgarh, Odisha, Maharashtra

Top forest cover % of area: Mizoram, Arunachal Pradesh, Meghalaya, Manipur, Nagaland

Net change: India showed a gain of ~1,445 sq km of forest + tree cover between 2021 and 2023 reports — positive trend; agroforestry and urban trees contributing.

[Additional] India's Protected Area Network — Tiger Reserves, Biosphere Reserves, Ramsar Sites (GS3 — Environment):

India's Protected Area Network (as of November 2023 — PIB):

India's strict PA coverage = ~5.3% of its land area (terrestrial); marine PA coverage = ~0.26%

IUCN Red List — all 9 categories: Extinct (EX) → Extinct in the Wild (EW) → Critically Endangered (CR) → Endangered (EN) → Vulnerable (VU) → Near Threatened (NT) → Least Concern (LC) → Data Deficient (DD) → Not Evaluated (NE)

"Threatened" = CR + EN + VU (the three categories with formal extinction risk assessment)

IUCN status of key Indian species:

Project Tiger and tiger reserves:

UNESCO Biosphere Reserves (India):

Ramsar Sites in India:

UPSC synthesis: Protected Area Network = GS3 Environment. Key exam facts: India's PAs = ~5.3% of land = 107 national parks + 573 sanctuaries + conservation reserves + community reserves; IUCN Threatened = CR + EN + VU; Great Indian Bustard = Critically Endangered + ~150 individuals; Bengal Tiger = Endangered (NOT Vulnerable); Gangetic Dolphin = Endangered = India's National Aquatic Animal; Asiatic Lion = Endangered = Gir, Gujarat only; Project Tiger = April 1, 1973 + Jim Corbett = first reserve; NTCA = September 4, 2006; Tiger Census 2022 = 3,682 (NOT 3,167 — that's the lower confidence bound); India = ~75% of world's wild tigers; tiger reserves = 58 (March 2025) = latest = Madhav, MP (58th); state with most tiger reserves = MP (9 reserves); biosphere reserves GoI = 18 + UNESCO WNBR = 13 (latest = Cold Desert 2025); first BR = Nilgiri 1986; Ramsar = 99 sites (April 2026) = state with most = Tamil Nadu (20). Prelims trap: Bengal Tiger = Endangered (NOT Vulnerable — a common coaching note error); tiger count 2022 = 3,682 (NOT 3,167 — 3,167 is the lower confidence interval bound, not the official figure); state with most Ramsar sites = Tamil Nadu (NOT UP — Tamil Nadu overtook UP with recent additions); UNESCO BRs = 13 (Cold Desert added September 2025; Panna in 2020 was 12th); biosphere reserves NTCA does NOT manage — NTCA manages tiger reserves; biosphere reserves are under MoEFCC directly.

[Additional] CBD Protocols, Aichi Targets, Kunming-Montreal GBF, and IPBES (GS3 — Environment / GS2 — International Conventions):

CBD — key facts:

Two Protocols under CBD:

Aichi Biodiversity Targets (2011–2020):

• Set at COP10, Nagoya, October 2010; 20 targets under 5 Strategic Goals
• Outcome (Global Biodiversity Outlook 5, CBD, 2020): Zero of the 20 targets were fully met globally
• Partial progress was made on some targets, but no target was fully achieved

Kunming-Montreal Global Biodiversity Framework (GBF, 2022):

COP16 (CBD, 2024–25):

• Held: Cali, Colombia, October 21 – November 1, 2024 (suspended due to lack of quorum)
• Resumed: Rome, Italy, February 25–27, 2025
• Key outcome: Established "Cali Fund" — benefit-sharing mechanism for Digital Sequence Information (DSI) from genetic resources; permanent subsidiary body for Indigenous Peoples and Local Communities (IPLCs)

IPBES — Global Assessment 2019:

• IPBES: Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services — established 2012; HQ = Bonn, Germany
• Global Assessment published: May 2019
• Key finding: ~1 million species threatened with extinction (out of ~8 million estimated species)
  • 40% of amphibians threatened; ~33% of reef-building corals; >33% of marine mammals; ~10% of insects

Five direct drivers of biodiversity loss (IPBES 2019, ranked highest to lowest impact):

1. Changes in land and sea use (habitat loss/degradation) — the dominant driver
2. Direct exploitation of organisms (hunting, fishing, logging, collecting)
3. Climate change
4. Pollution
5. Invasive alien species

India and the 30×30 target — gap:

• India's current strict PA coverage: ~5.3% of land + ~0.26% of marine area
• Gap to 30% target on land = ~24.7 percentage points
• India's pathway to 30×30 must rely on OECMs (Other Effective Area-Based Conservation Measures) — community forests, private reserves, eco-sensitive zones

UPSC synthesis: CBD + GBF = GS3 International Environment Conventions. Key exam facts: CBD = opened for signature June 5, 1992 (Rio Earth Summit) = entered into force December 29, 1993 = 196 parties = Secretariat Montreal = three objectives; Nagoya Protocol = ABS = adopted October 29, 2010 (COP10) = in force October 12, 2014 = India ratified October 9, 2012; Cartagena Protocol = LMOs/biosafety = adopted January 29, 2000 = in force September 11, 2003; Aichi Targets = 20 targets (2011–2020) = zero fully met (GBO5, 2020); Kunming-Montreal GBF = adopted December 19, 2022 = COP15 Montreal = 4 goals + 23 targets = replaces Aichi = 30×30 target (Target 3) = protect 30% land + 30% ocean by 2030 = finance target USD 200 billion/year; COP16 = Cali, Colombia 2024 + resumed Rome 2025 = "Cali Fund" for DSI benefit-sharing; IPBES = established 2012 = HQ Bonn, Germany = 2019 assessment = ~1 million species threatened = top driver = land/sea use changes (NOT climate change — climate change is 3rd). Prelims trap: May 22 = International Biodiversity Day (day text finalized) vs June 5 = CBD opened for signature at Rio (World Environment Day) — two different dates; Aichi Targets = zero fully met (NOT 6 — some partial progress occurred but zero were fully achieved); CBD Secretariat = Montreal (NOT Geneva or Nairobi — UNEP is in Nairobi; CBD Secretariat is specifically in Montreal); Cartagena Protocol = LMOs/GMOs biosafety (NOT ABS — ABS is the Nagoya Protocol; the two protocols are often confused); IPBES top driver = land/sea use change (NOT climate change — climate is 3rd; this ranking is tested).