Environment
Ecology, biodiversity, conservation and climate.
Reading NCERTs first? See which chapter maps to which note →New to Environment prep? Read the study roadmap →- Chapter 1 of 31
Food Webs, Nutrient Cycles and Pollinators
How energy moves through trophic levels, how carbon, nitrogen and phosphorus cycle through ecosystems, and how pollination and seed dispersal actually work.
12 min readShankar IAS, Environment · Ecology and Food Chains - Chapter 2 of 31
Wetlands and the Ramsar Convention
What wetlands are, why they matter, how the Ramsar Convention actually works, and the criteria that have nothing to do with National Park status.
12 min readShankar IAS, Environment · Wetlands & Conservation - Chapter 3 of 31
India's Water Stress and the Water-Energy Nexus
Verified per-capita water data, Punjab and Haryana's groundwater over-extraction, Atal Bhujal Yojana's real numbers, and how power and water depend on each other.
10 min readShankar IAS, Environment · Water Resources - Chapter 4 of 31
Air Pollution, AQI and Acid Rain in India
CPCB's AQI: 8 pollutants, 6 verified categories from Good to Severe, acid rain chemistry, vehicular sources, and the stubble-burning CRM Scheme.
11 min readShankar IAS, Environment · Air Pollution - Chapter 5 of 31
Water, Soil and Chemical Pollution in India
CPCB's water quality classes, BIS arsenic and fluoride limits, thermal power emission norms, and soil salinization, all against verified primary standards.
11 min readShankar IAS, Environment · Pollution - Chapter 6 of 31
Plastic Pollution, Microplastics and EDCs
Global and Indian plastic waste numbers, primary versus secondary microplastics, and how BPA and phthalates mimic hormones, verified against UNEP, NOAA and NIEHS.
10 min readShankar IAS, Environment · Pollution, Plastics and Endocrine Disrupting Chemicals - Chapter 7 of 31
Waste Management Rules and EPR in India
SWM Rules 2016 segregation duties, E-Waste EPR recycling targets, the single-use plastic ban's exact dates, hazardous waste TSDFs, and waste-to-energy's record.
11 min readShankar IAS, Environment · Waste Management - Chapter 8 of 31
NGT and CPCB: Founding Acts and Powers
CPCB was born under the Water Act 1974, not EPA 1986. NGT Schedule I excludes Wildlife Protection; appeals go straight to the Supreme Court.
10 min readShankar IAS, Environment · Environmental Institutions: NGT and CPCB - Chapter 9 of 31
Species Adaptations, Extinction and Invasives
IUCN Red List categories in order, real Indian invasive species, and the Gadgil versus Kasturirangan Western Ghats committees compared precisely.
12 min readShankar IAS, Environment · Biodiversity Loss and Extinction - Chapter 10 of 31
Indian Forest Types, Flora and Red Sanders
Champion and Seth's forest classification, teak and sandalwood's real economics, and why red sanders, a Pterocarpus, is not true sandalwood at all.
10 min readShankar IAS, Environment · Indian Flora - Chapter 11 of 31
Indian Wildlife and Biodiversity Hotspots
The criteria that define a biodiversity hotspot, India's four hotspots and their endemism numbers, and how two key wildlife Acts pull in different directions.
12 min readShankar IAS, Environment · Indian Wildlife and Biodiversity Hotspots - Chapter 12 of 31
Protected Area Categories and Tiger Reserves
How National Parks, Sanctuaries, Conservation and Community Reserves differ, plus Biosphere Reserves, tiger core-buffer rules and biogeographic zones.
10 min readShankar IAS, Environment · Protected Area Categories - Chapter 13 of 31
Project Elephant, Barasingha and Cheetah Revival
Project Elephant's real numbers, Kanha's barasingha recovery, why musk deer are poached, and Kuno's cheetah reintroduction, successes and setbacks both.
13 min readShankar IAS, Environment · Wildlife, Elephant Conservation - Chapter 14 of 31
Wildlife Protection Act: Beyond the Schedules
Section 9's hunting ban and its real exceptions, ownership certificates under Section 42, the Chief Wildlife Warden, the Boards for Wildlife, and penalties.
13 min readShankar IAS, Environment · Wildlife Protection Law, Ownership and Protection - Chapter 15 of 31
Forest Conservation Act, CAMPA and the FRA
The FC Act's 2023 rename and real exemptions, CAMPA's 90:10 fund split, the FRA's 4-hectare cap, Miyawaki forests, and current ISFR state rankings.
13 min readShankar IAS, Environment · Forest governance, Forest Rights Act - Chapter 16 of 31
Methane Hydrates, Emissions and Climate Impacts
Methane hydrates as a feedback risk, industrial process emissions, sea level rise, ocean acidification and extreme weather attribution to climate change.
11 min readShankar IAS, Environment · Climate Change, Greenhouse Gases and Methane Hydrates - Chapter 17 of 31
India's Carbon Credit Trading Scheme and Pricing
India's Carbon Credit Trading Scheme, the carbon tax versus cap-and-trade divide, and how mangroves, soils and forests sequester carbon naturally.
10 min readShankar IAS, Environment · Carbon Trading and Climate Finance - Chapter 18 of 31
UNFCCC, Kyoto Protocol and Paris Agreement
How the 1992 UNFCCC, Kyoto Protocol binding Annex I targets with CDM/JI/ET, and the Paris Agreement non-binding NDC ratchet model actually differ.
8 min readShankar IAS, Environment · International Environmental Agreements: UNFCCC and INDCs - Chapter 19 of 31
The NAPCC and the Green India Mission
The NAPCC's exact eight named missions from 2008, and the Green India Mission's real hectare targets and CO2 goals, verified against the official documents.
9 min readShankar IAS, Environment · National Action Plan on Climate Change: Green India Mission - Chapter 20 of 31
Ozone Layer Depletion: Chapman Cycle to Hole
How UV radiation forms and destroys stratospheric ozone, why the hole sits over Antarctica, its 2025 size, and the UV-B effects it lets through.
9 min readShankar IAS, Environment · Ozone-Depleting Substances and HFCs - Chapter 21 of 31
Renewable Energy and Climate Mitigation Tech
Green hydrogen, the National Solar Mission, the International Solar Alliance, offshore wind, carbon capture and geoengineering: the real scheme numbers behind India's Panchamrit targets.
13 min readShankar IAS, Environment · Renewable Energy and Climate Change Mitigation Technologies - Chapter 22 of 31
Nuclear Energy, IAEA Safeguards and BEE Labels
India's three-stage thorium programme, non-NPT IAEA safeguards status since 2008, and BEE's 1 to 5 star efficiency labels, with the real figures tested.
10 min readShankar IAS, Environment · Energy Resources - Chapter 23 of 31
Agriculture, Climate Change and GM Crops
Agriculture's real GHG share by source, zero tillage and biochar's verified carbon role, and the current, unsettled legal status of Bt cotton and GM mustard.
11 min readShankar IAS, Environment · Sustainable Agriculture - Chapter 24 of 31
Environment (Protection) Act 1986: EIA and CRZ
How Section 3's broad power to take 'all measures necessary' produced the EIA and CRZ notifications, plus the Act's entry, inspection and penalty provisions.
12 min readShankar IAS, Environment · Environmental Protection Act 1986 - Chapter 25 of 31
Agenda 21, TRAFFIC, UNCCD and the Polar Code
The Rio Summit gave more than the UNFCCC: Agenda 21, the Rio Declaration, TRAFFIC, the UNCCD, IMO Polar Code and GACSA, the international bodies PYQs test.
9 min readShankar IAS, Environment · International Environmental Organisations - Chapter 26 of 31
Sustainable Development, SDGs and Green Roads
The Brundtland definition, the 17 SDGs and NITI Aayog's role, and green PMGSY road technologies, the exact facts these three angles are tested on.
10 min readShankar IAS, Environment · Sustainable Development: SDGs - Chapter 27 of 31
Five-Kingdom System, Fungi and Viruses
Whittaker's five-kingdom criteria, fungi as decomposers and mycorrhizal symbionts, and why viruses, viroids and prions sit outside all five kingdoms.
9 min readNCERT (Biology) · Fungi - Chapter 28 of 31
Plant and Animal Classification Basics
The NCERT biology basics tested in Environment: the plant kingdom's five divisions, flowering-plant morphology from root to flower, three Indian plant families by their floral characters, the criteria that sort animal phyla, and the four classes of fungi.
15 min readNCERT (Biology) · Morphology of Flowering Plants; Animal Kingdom; Biological Classification (Kingdom Fungi) - Chapter 29 of 31
Animal Kingdom: Porifera to Chordata
Each animal phylum's real defining features and named examples, from sponges to chordates, plus the classic all-vertebrates-are-chordates trap.
10 min readNCERT (Biology) · Animal Classification - Chapter 30 of 31
Population Growth, Interactions and Age Pyramids
Exponential versus logistic growth and carrying capacity, the exact +/-/0 notation for mutualism, competition, predation and parasitism, and age pyramid shapes.
11 min readNCERT (Biology) · Animal Behaviour - Chapter 31 of 31
Ecosystem Productivity, Decomposition, Succession
GPP, NPP and secondary productivity explained precisely, the real steps of decomposition, and how primary and secondary succession reach a climax community.
9 min readNCERT (Biology) · Nutrient cycles and symbiotic nitrogen fixation