BharatNotes Air, water, and soil are the three natural resources on which all life depends — and all three are under unprecedented pressure from human activity. Climate change (air), water crisis, and land degradation directly shape India's development challenges and appear in virtually every UPSC GS3 mains paper. This chapter builds the scientific foundation for those policy debates: why greenhouse gases warm the Earth, how the nitrogen cycle underpins agriculture, why topsoil loss threatens food security. No UPSC aspirant can afford to skip this chapter.
PART 1 — Quick Reference Tables
Atmospheric Composition
| Gas | Approximate Percentage | Notes |
|---|---|---|
| Nitrogen (N2) | 78.09% | Biologically inert in atmosphere; fixed by bacteria |
| Oxygen (O2) | 20.95% | Produced by photosynthesis |
| Argon (Ar) | 0.93% | Noble gas, inert |
| Carbon dioxide (CO2) | 0.04% (~424.6 ppm, 2024 annual avg; NOAA Mauna Loa) | Primary greenhouse gas; rising due to fossil fuels |
| Water vapour (H2O) | Variable (0–4%) | Most abundant greenhouse gas by mass |
| Others | Traces | Neon, Helium, Methane, Ozone, Nitrous oxide |
Layers of the Atmosphere
| Layer | Altitude | Key Features | Relevance |
|---|---|---|---|
| Troposphere | 0–12 km | Weather occurs here; temperature decreases with altitude; contains 75% of atmosphere's mass | All weather, climate, pollution |
| Stratosphere | 12–50 km | Ozone layer (20–35 km); temperature increases with altitude (ozone absorbs UV) | Ozone hole; aircraft travel |
| Mesosphere | 50–80 km | Temperature decreases with altitude; meteors burn up here | |
| Thermosphere | 80–600 km | Very high temperatures; aurora borealis; ISS orbits here | Satellite communication |
| Exosphere | 600+ km | Transition to outer space |
Soil Components
| Component | Approximate % | Function |
|---|---|---|
| Minerals (inorganic particles) | 45% | Provide structure and mineral nutrients |
| Organic matter (humus) | 5% | Water retention; nutrient release; supports microbes |
| Water | 25% | Dissolves nutrients; plant uptake |
| Air | 25% | Oxygen for root respiration and soil organisms |
Biogeochemical Cycles — Summary
| Cycle | Key Reservoirs | Key Processes | Human Impact |
|---|---|---|---|
| Carbon | Atmosphere, ocean, biomass, fossil fuels | Photosynthesis, respiration, combustion, decomposition | Fossil fuel burning → CO2 rise → climate change |
| Nitrogen | Atmosphere (78% N2) | Fixation, nitrification, denitrification, decomposition | Synthetic fertiliser → N2O (greenhouse gas); eutrophication |
| Water | Oceans, glaciers, groundwater | Evaporation, condensation, precipitation, transpiration, infiltration | Overextraction of groundwater; deforestation disrupts cycle |
| Oxygen | Atmosphere, water, minerals | Photosynthesis, respiration, combustion, weathering | Deforestation reduces O2 production |
PART 2 — Detailed Notes
1. Air — Composition and Importance
The atmosphere is a thin gaseous envelope held by gravity. Its composition is remarkably stable because biological processes (photosynthesis, respiration, nitrogen fixation, decomposition) continuously cycle elements.
Air is essential for:
- Respiration (O2 for aerobic organisms)
- Photosynthesis (CO2 as raw material)
- Weather and climate (water vapour, temperature regulation)
- Protecting Earth from UV radiation (ozone layer in stratosphere)
Wind is caused by unequal heating of different parts of Earth's surface. Land heats and cools faster than water. During the day, air over land is warmer and rises; cooler air from over the sea moves in — sea breeze. At night, the reverse occurs — land breeze. Seasonal patterns of heating give rise to the Indian monsoon.
Air pollution occurs when harmful substances enter the atmosphere. Sources: fossil fuel combustion (coal, petrol, diesel), industrial emissions, crop burning. Primary pollutants: CO, SO2, NOx, particulate matter (PM2.5, PM10). Secondary pollutants form from chemical reactions: ozone (at ground level), nitric acid, sulphuric acid (acid rain). India's National Clean Air Programme (NCAP) 2019 originally targeted 20–30% PM reduction by 2024; revised in 2022 to 40% reduction in PM10 by 2026 (from 2017 baseline) for 131 non-attainment cities. [Additional] Status (2025): Target widely considered unachievable — 190/229 monitored cities still exceed NAAQS for PM10; Delhi's annual PM2.5 was 105 µg/m³ vs WHO guideline of 15 µg/m³.
2. The Greenhouse Effect and Climate Change
Natural greenhouse effect: Certain gases in the atmosphere (CO2, water vapour, methane, N2O, ozone) trap outgoing infrared radiation from Earth's surface, warming the planet. Without this, Earth's average temperature would be -18°C instead of +15°C — life as we know it would be impossible.
Enhanced greenhouse effect: Since the Industrial Revolution (~1750), human activities have increased atmospheric CO2 from ~280 ppm to ~424.6 ppm (2024 annual average, Mauna Loa, NOAA; 2025 seasonal peak exceeded 430 ppm). This enhances the natural greenhouse effect, causing global warming and climate change.
Greenhouse gases by global warming potential (GWP, per molecule over 100 years):
- CO2 — GWP = 1 (the reference)
- Methane (CH4) — GWP = 27–30 (produced by rice paddies, cattle, landfills, natural gas leaks)
- Nitrous oxide (N2O) — GWP = 273 (from synthetic fertilisers, animal waste)
- HFCs/PFCs/SF6 — GWP in thousands (industrial gases)
🎯 UPSC Connect: Paris Agreement and India's NDC
The Paris Agreement (2015) under UNFCCC commits countries to limiting global average temperature rise to 1.5°C above pre-industrial levels. Countries submit Nationally Determined Contributions (NDCs) — voluntary climate targets.
India's Updated NDC (2022, covering 2021-2030):
- Reduce emission intensity of GDP by 45% by 2030 (from 2005 levels)
- Achieve 50% of cumulative electric power installed capacity from non-fossil fuel sources by 2030
- Create additional carbon sink of 2.5–3 billion tonnes of CO₂ equivalent through forest and tree cover
India also committed to Net Zero emissions by 2070 at COP26 (Glasgow, 2021).
[Additional] India's NDC 3.0 (2031–2035) — Submitted April 24, 2026: Cabinet approved March 25, 2026; submitted to UNFCCC on April 24, 2026. India's next-period targets:
- Reduce emission intensity of GDP by 47% from 2005 levels by 2035 (up from 45% by 2030)
- Achieve 60% of installed power capacity from non-fossil fuels by 2035 (up from 50% by 2030)
- Create additional carbon sink of 3.5–4.0 billion tonnes CO₂ equivalent by 2035 (up from 2.5–3.0 Gt by 2030)
- Net Zero by 2070 remains unchanged India's NDC 3.0 is incremental (not transformational); global NDC 3.0 ambition collectively falls far short of the 1.5°C pathway.
3. Water — The Universal Solvent
Water covers about 71% of Earth's surface, but only 2.5% is freshwater, and of that, 70% is frozen in glaciers and ice caps. Only about 0.3% of all water on Earth is in liquid freshwater lakes and rivers accessible to humans.
The Water Cycle (Hydrological Cycle):
- Evaporation — sun heats surface water → water vapour rises
- Transpiration — plants release water vapour through stomata (collectively, evapotranspiration)
- Condensation — water vapour cools and condenses on dust particles → clouds form
- Precipitation — rain, snow, hail fall
- Surface runoff — water flows over land to rivers and lakes
- Infiltration — water seeps into soil → recharges groundwater
- Percolation — deeper movement to aquifers
Importance of water:
- Universal solvent — all biochemical reactions in cells occur in water
- Thermoregulation — high specific heat of water buffers temperature
- Habitat for aquatic organisms
- Agriculture — irrigation
Water pollution: Addition of harmful substances that degrade water quality. Sources: industrial effluents (heavy metals — lead, mercury, cadmium), agricultural runoff (pesticides, fertilisers — eutrophication), sewage, oil spills. India's Jal Jeevan Mission (JJM, 2019) originally targeted tap water connection to every rural household by 2024 — deadline extended; coverage reached ~81.71% (~15.82 crore of 19.36 crore rural households) as of March 2026 (Jal Shakti Ministry). NMCG (National Mission for Clean Ganga) / Namami Gange programme targets Ganga rejuvenation.
4. Soil — The Living Skin of the Earth
Soil is not inert rock particles — it is a living ecosystem hosting billions of microorganisms per gram. Good topsoil takes hundreds to thousands of years to form.
Soil formation processes:
- Weathering of parent rock — physical (temperature changes, frost), chemical (oxidation, hydrolysis), biological (lichens, roots breaking rock)
- Accumulation of organic matter — decomposition of dead plants and animals by bacteria and fungi → humus
- Leaching — water carries minerals down through soil layers (horizons)
- Biological activity — earthworms till soil, bacteria fix nitrogen, fungi form mycorrhizal networks
Soil profile (horizons):
- O horizon: Organic litter (leaf litter, partially decomposed material)
- A horizon (topsoil): Humus-rich, most fertile layer; where crops grow
- B horizon (subsoil): Accumulation of minerals leached from above; less organic matter
- C horizon: Partially weathered parent material
- R horizon: Bedrock
Soil erosion — removal of topsoil faster than it forms:
- Water erosion: Rainfall impact, surface runoff, rivers. Forms gullies and ravines. Most severe on slopes.
- Wind erosion: Blowing away of dry, bare topsoil. Major problem in Rajasthan, Haryana, and semi-arid areas.
Consequences: Loss of fertility, desertification, silting of reservoirs, flooding.
Conservation measures: Contour ploughing, terracing on slopes, windbreaks (shelterbelts of trees), maintaining vegetative cover, avoiding overgrazing, afforestation.
5. Biogeochemical Cycles
Carbon Cycle: Carbon moves between atmosphere, living organisms, soil, and oceans:
- Photosynthesis: Plants absorb CO2 → organic molecules (glucose)
- Respiration: All organisms break down glucose → release CO2
- Combustion: Burning of fossil fuels and biomass → CO2 release
- Decomposition: Dead organic matter broken down by bacteria/fungi → CO2 released, some becomes humus
- Ocean absorption: Oceans absorb about 25–30% of anthropogenic CO2 → ocean acidification
Nitrogen Cycle: Nitrogen makes up proteins, DNA, and RNA — essential for life. But N2 gas is highly stable and cannot be used directly by most organisms.
Steps in the nitrogen cycle:
- Nitrogen fixation: Conversion of N2 → ammonia (NH3). Done by: free-living bacteria (Azotobacter in soil; Anabaena in water), symbiotic bacteria in legume root nodules (Rhizobium), lightning (small amount).
- Ammonification: Decomposition of dead organisms → ammonia → ammonium ions (NH4+).
- Nitrification (two-step):
- Nitrifying bacteria Nitrosomonas: NH4+ → nitrites (NO2-)
- Nitrobacter: NO2- → nitrates (NO3-) — the form plants absorb
- Assimilation: Plants absorb nitrates → convert to proteins; animals eat plants → nitrogen moves up food chain.
- Denitrification: Anaerobic bacteria (Pseudomonas, Thiobacillus) convert nitrates → N2 gas — returned to atmosphere. Occurs in waterlogged soils and swamps.
💡 Explainer: Nitrogen Cycle and Agriculture
The nitrogen cycle explains why:
- Legume rotation improves soil fertility — Rhizobium bacteria in root nodules fix atmospheric N2 into ammonia, enriching the soil with usable nitrogen.
- Synthetic fertilisers (urea, DAP) bypass the natural cycle, delivering nitrogen directly — but excess causes eutrophication in water bodies and N2O emissions (a potent greenhouse gas).
- Waterlogged paddy fields are major sources of methane (CH4) and N2O.
- India is the world's second-largest consumer of synthetic fertilisers — significant implications for water quality, soil health, and greenhouse gas emissions.
Oxygen Cycle: Oxygen is produced by photosynthesis and consumed by respiration and combustion. The stratospheric ozone layer is formed when O2 molecules absorb UV radiation and split, then recombine as O3. CFCs (chlorofluorocarbons) catalytically destroy ozone — controlled by the Montreal Protocol 1987 (the Kigali Amendment 2016 extended the Montreal Protocol to phase down HFCs, potent greenhouse gases).
PART 3 — Frameworks & Analysis
Framework: India's Water Stress
India has ~4% of the world's freshwater but ~18% of the world's population. Key facts:
- 54% of India faces high or extremely high water stress (WRI Aqueduct, 2019)
- Groundwater depletion — 89% of India's groundwater is used for irrigation
- 600 million people face high to extreme water stress
- Major rivers are fed by Himalayan glaciers — glacier retreat threatens long-term water security
Framework: Land Degradation in India
About 29.7% of India's land area is degraded (ISRO 2021 assessment):
- Water erosion: 10.98 million hectares
- Wind erosion: 5.55 million hectares
- Salinity/waterlogging (from over-irrigation): 1.43 million hectares
India's commitments: Restore 26 million hectares of degraded land by 2030 under the Bonn Challenge and Land Degradation Neutrality (LDN) target under UNCCD.
[Additional] 14a. Global Stocktake (GST1) — The Verdict on 1.5°C and COP28's Historic Fossil Fuel Language
The chapter covers the Paris Agreement (2015) and India's NDC. What is missing is the first formal Global Stocktake (GST1) — the Paris Agreement's own assessment mechanism that delivered the definitive verdict on whether the world is on track for 1.5°C, completed at COP28 in December 2023.
What is the Global Stocktake (GST)? Article 14 of the Paris Agreement mandates a periodic global assessment — the Global Stocktake — to measure collective progress against the Paris Agreement's goals. It is not a country-by-country audit but an overall assessment of whether total global action adds up to the required trajectory.
The 1.5°C carbon budget constraint: To stay within 1.5°C of warming, IPCC AR6 calculates that global GHG emissions must fall 43% below 2019 levels by 2030 and reach net zero by mid-century. The carbon cycle science explains why: CO₂ is cumulative in the atmosphere — every additional tonne adds to the total stock. The current 2024 atmospheric CO₂ level (422.7 ppm, WMO) is already the highest in at least 3 million years. The record single-year CO₂ jump of 3.5 ppm in 2023–24 (the largest since modern measurements began in 1957) shows acceleration, not deceleration.
[Additional] COP28 UAE (Dubai, December 2023) — Global Stocktake and the Fossil Fuel Transition — GS3 (Environment / Climate Change):
GST1 Findings:
- GST1 formally confirmed the world is NOT on track for 1.5°C
- Under current national policies: projected warming of 2.5–2.9°C by 2100
- Even with full implementation of all current NDC pledges: warming still reaches 2.3–2.5°C
- Required: 43% GHG emissions cut by 2030 vs 2019; current trajectory achieves far less
The UAE Consensus — historic fossil fuel language: COP28 adopted two landmark calls:
- "Transitioning away from fossil fuels in energy systems, in a just, orderly and equitable manner" — the first time in nearly 30 years of UN climate negotiations that agreed text explicitly names fossil fuels as requiring a transition. All previous COP texts avoided naming fossil fuels. (Note: "transition away" was agreed rather than "phase out" — the distinction is significant for countries dependent on coal and gas.)
- Triple renewables + double energy efficiency by 2030: Countries committed to tripling global renewable energy capacity and doubling the global average annual rate of energy efficiency improvements by 2030 — IEA estimates this could cut ~10 billion tonnes CO₂ by 2030
India's position at COP28 (December 2023):
- Delivered by Union Minister Bhupender Yadav (MoEFCC); PM Modi attended and addressed
- PM Modi's message: "A small section of mankind has exploited nature indiscriminately. But the whole of humanity is paying its price, especially the residents of the global south." — positioned India as the leader of the Global South
- India welcomed the fossil fuel transition language but insisted on "just, affordable and inclusive energy transition" and "common but differentiated responsibilities" — meaning rich nations must transition faster and fund developing country transitions
- India criticized the climate finance pledges as "microscopic" relative to developing country needs
- India highlighted: 33% emissions intensity reduction achieved 2005–2019 (NDC target met 11 years early); 43% non-fossil installed electricity capacity reached
NDC 3.0 context: India's NDC 3.0 (submitted to UNFCCC April 24, 2026, covering 2031–2035) increased ambition: 47% emissions intensity reduction by 2035 (from 45% by 2030); 60% non-fossil power capacity by 2035; forest carbon sink raised to 3.5–4.0 Gt CO₂eq by 2035.
UPSC synthesis: The GST is the Paris Agreement's own accountability mechanism — it bridges carbon cycle science (this chapter) to international climate governance (GS2) and India's climate policy (GS3). The "transition away from fossil fuels" language is a direct Prelims MCQ target (first time fossil fuels named in COP text) and a Mains conceptual anchor for questions on climate equity and CBDR.
[Additional] 14b. Soil Organic Carbon — India's Climate Solution in the Ground
The chapter covers soil composition (5% organic matter/humus) and the carbon cycle (photosynthesis, decomposition, fossil fuels) but misses a critical link: soil itself is a major carbon store and a climate mitigation tool — directly relevant to India's NDC forest/tree carbon sink target and to the chapter's own biogeochemical cycle content.
Soil Organic Carbon (SOC) — the carbon in the ground: Soil organic carbon (SOC) is the carbon stored in soil as humus, decomposing plant residues, and microbial biomass — exactly the "organic matter (5%)" listed in this chapter's soil components table. SOC is part of the global carbon cycle:
- Healthy soils act as a carbon sink: Absorb CO₂ from the atmosphere through plant growth → root death and decomposition → humus formation → carbon stored in soil for years to centuries
- Degraded soils are a carbon source: Tillage, erosion, deforestation, and waterlogging release stored soil carbon as CO₂ — reversing the carbon sink into a carbon source
Global soil carbon stocks (top 2 metres): approximately 2,500 Gt of carbon — more than the atmosphere (860 Gt) and all living vegetation combined (550 Gt). Small changes in SOC therefore have large climate consequences.
[Additional] India's Soil Carbon Crisis and Climate Mitigation — GS3 (Climate / Agriculture / Environment):
India's soil carbon status:
- India's soil organic carbon (SOC) levels have declined to less than 0.5% in many degraded agricultural areas — well below the optimal 1.0–1.5% needed for soil health (ICAR)
- India loses 5.3 billion tonnes of topsoil annually due to erosion — removing stored carbon along with nutrients
- ~30% of India's land cover is degraded — erosion, salinity, and low organic matter (MoEFCC/ICAR)
- IPCC AR6 (WGIII, 2022): improved soil carbon management on cropland and grasslands has global mitigation potential of 4.1 GtCO₂eq/year
India's forest carbon sink NDC — ISFR 2023 (PIB/FSI, December 2023): India's NDC target: create additional carbon sink of 2.5–3 billion tonnes CO₂eq by 2030 (from 2005 baseline) through forest and tree cover.
| Metric | Value |
|---|---|
| Additional carbon sink achieved (2005→2023) | 2.29 Gt CO₂eq — 91% of the 2.5 Gt minimum target, with 7 years left |
| Total forest carbon stock (India 2023) | 30.43 Gt CO₂eq |
| Forest and tree cover (2023) | 8,27,357 sq km = 25.17% of India's geographical area |
| Increase since ISFR 2021 | 1,445 sq km additional forest/tree cover |
| Projection for 2030 | India on track to exceed target: projected 3.57 Gt CO₂eq by 2030 |
| NDC 3.0 target (2031–2035) | 3.5–4.0 Gt CO₂eq additional carbon sink by 2035 |
India's soil carbon policy instruments:
- Soil Health Card Scheme (launched February 19, 2015): Over 25 crore cards issued (July 2025) providing site-specific fertiliser recommendations; optimising fertiliser use reduces N₂O (a potent GHG) and builds SOC over time
- National Mission for Green India (GIM): One of 8 NAPCC missions (MoEFCC); targets increasing forest/tree cover on 5 million hectares + improving quality on another 5 mha; carbon sequestration target: 50–60 million tonnes CO₂/year from forest restoration
- National Mission for Sustainable Agriculture (NMSA): Promotes agroforestry, crop residue incorporation, and organic farming (PKVY — Paramparagat Krishi Vikas Yojana) to rebuild SOC
- Voluntary Carbon Market Framework for Agriculture (2024): GOI launched a framework allowing farmers to earn carbon credits for sustainable soil practices (biochar, green manuring, agroforestry); domestic price ~₹195/tonne CO₂ currently; ICAR-CIMMYT collaboration for smallholder carbon market access
UPSC synthesis: Soil carbon is the bridge between this chapter's carbon cycle science (organic matter → decomposition → CO₂) and climate policy (India's NDC sink target, GIM, NMSA). The ISFR 2023 data showing India has already sequestered 2.29 Gt CO₂eq (91% of target) is a direct Prelims MCQ fact and a Mains answer anchor. The SOC crisis (<0.5% in degraded soils vs optimal 1–1.5%) connects soil degradation (this chapter's erosion section) to food security and climate simultaneously.
[Additional] 14b. India's Carbon Credit Trading Scheme (CCTS) — Statutory Basis and Market Design
The chapter covers natural resources including air and the carbon cycle. It does not address India's Carbon Credit Trading Scheme (CCTS) — the domestic carbon market established under the Energy Conservation (Amendment) Act 2022 to create economic incentives for emissions reduction. This is the most important current affairs development connected to the chapter's climate science content.
Key Terms — Carbon Credits and CCTS:
| Term | Meaning |
|---|---|
| Carbon credit | A tradeable certificate representing the right to emit one tonne of CO₂ equivalent (CO₂e); credits are bought by entities that need to emit more and sold by entities that emit less |
| Carbon Credit Certificate (CCC) | The specific instrument under India's CCTS; 1 CCC = 1 tonne of CO₂ equivalent reduced or avoided |
| CCTS (Carbon Credit Trading Scheme) | India's domestic carbon market; notified June 2023; creates a mandatory compliance market for obligated industries + a voluntary offset market for other entities |
| BEE (Bureau of Energy Efficiency) | India's nodal agency administering the CCTS; operates under Ministry of Power; was also the nodal agency for the PAT scheme that preceded CCTS |
| PAT (Perform Achieve and Trade) | The predecessor scheme; energy efficiency-based certificates traded among Designated Consumers; CCTS is a broader carbon market that subsumes and extends beyond PAT |
| Carbon sink | A natural or artificial reservoir that absorbs more CO₂ than it releases; forests, oceans, wetlands are natural sinks; relevant as carbon offset sources under voluntary CCTS track |
[Additional] Carbon Credit Trading Scheme (CCTS) — India's Domestic Carbon Market (GS3 — Environment / Economy):
Statutory basis — the legal chain:
| Step | Detail |
|---|---|
| Energy Conservation Act, 2001 | Original Act establishing BEE and energy efficiency framework |
| Energy Conservation (Amendment) Act, 2022 | Amended the 2001 Act to add Section 14A — the statutory authority for a carbon credit trading scheme in India; assented to December 19, 2022; notified in force January 1, 2023 |
| CCTS Rules, 2023 | Specific scheme rules officially notified June 2023 by Ministry of Power |
| Governing Ministry | Ministry of Power (NOT MoEFCC — this distinction is a frequent exam trap) |
| Nodal Agency | Bureau of Energy Efficiency (BEE) |
CCTS structure — two tracks:
| Track | Entities | Mechanism |
|---|---|---|
| Compliance (Mandatory) Mechanism | Obligated entities = energy-intensive industries above threshold | Assigned carbon credit targets; must meet targets or buy CCCs from those with surplus |
| Offset (Voluntary) Mechanism | Any entity not in the mandatory track | Can earn CCCs by demonstrating verified emission reductions; sell credits in the market |
Sectors covered (as of 2025):
| Status | Sectors | Approx. entities |
|---|---|---|
| Currently obligated (7 sectors) | Aluminium, Cement, Chlor-alkali, Pulp & Paper, Petroleum refining, Petrochemicals, Textiles | ~490 entities |
| Planned (2 additional sectors) | Fertiliser, Iron & Steel | ~740 entities total when added |
Key design features:
| Feature | Detail |
|---|---|
| 1 CCC = | 1 tonne CO₂ equivalent reduced/avoided |
| Transition from PAT | CCTS began transitioning from PAT scheme in FY2026 (April 2025 onward) |
| First trading | First CCC trading expected mid-2026 (exchange-based trading) |
| Trading platform | National carbon exchange (BSE and NSE designated as carbon credit exchanges) |
| Registry | National Designated Registry maintained by BEE for all CCCs |
| Verification | Third-party verification agencies accredited by BEE |
| International linkage | Currently domestic only; eventual international linking under Article 6 of Paris Agreement is a future possibility |
CCTS vs PAT scheme:
| Dimension | PAT (Perform Achieve Trade) | CCTS |
|---|---|---|
| What is traded | Energy Saving Certificates (ESCerts) | Carbon Credit Certificates (CCCs) |
| Metric | Energy efficiency improvement | Absolute emissions reduction (CO₂e) |
| Coverage | ~13 sectors, ~1,000 DCs | 7 sectors initially → expanding |
| Authority | BEE under Ministry of Power | BEE under Ministry of Power |
| International | Not linked to global carbon market | Future Article 6 linkage possible |
India's climate commitments — context:
| Commitment | Detail |
|---|---|
| NDC target | India committed at COP26 (Glasgow, 2021) to reduce GDP emissions intensity by 45% by 2030 (from 2005 levels); achieve 50% non-fossil electricity capacity by 2030 |
| Net Zero | India's net zero target = 2070 |
| Carbon market role | CCTS is a key domestic policy instrument to achieve NDC targets through market mechanisms |
| UNFCCC | India ratified the Paris Agreement October 2, 2016 (Gandhi Jayanti) |
UPSC synthesis: Key exam facts: CCTS notified June 2023; statutory basis = Energy Conservation (Amendment) Act 2022 (notified in force January 1, 2023); ministry = Ministry of Power (NOT MoEFCC); nodal agency = BEE (Bureau of Energy Efficiency); 1 CCC = 1 tonne CO₂ equivalent; currently 7 sectors, ~490 entities obligated; planning to add fertiliser and iron & steel = ~740 entities total; first CCC trading expected mid-2026; two tracks: mandatory compliance + voluntary offset; PAT scheme used ESCerts (energy) while CCTS uses CCCs (carbon); India NDC = 45% emissions intensity reduction by 2030 + 50% non-fossil electricity; India net zero = 2070. Prelims trap: CCTS is administered by Ministry of Power (NOT Ministry of Environment Forest and Climate Change — MoEFCC handles forest clearances, EIA, wildlife; carbon MARKET is under Power/BEE); 1 CCC = 1 tonne CO₂e (NOT 1 carbon credit = permission to emit 1 tonne — CCTS CCCs represent reductions, not emission allowances per se); the predecessor scheme was PAT = traded ESCerts (Energy Saving Certificates, NOT carbon credits); India's net zero target is 2070 (NOT 2050 — that's USA, UK, EU; NOT 2060 — that's China); Paris Agreement ratified by India on October 2, 2016 (NOT December 2015 — COP21 was in December 2015 but India ratified later).
Exam Strategy
Prelims traps:
- The most abundant greenhouse gas by mass is water vapour, not CO2. But CO2 is the most important human-influenced greenhouse gas.
- Ozone in the stratosphere is protective; ozone at ground level (troposphere) is a pollutant.
- Nitrosomonas converts ammonium to nitrite; Nitrobacter converts nitrite to nitrate — don't mix up these two nitrifying bacteria.
- Denitrification returns nitrogen to the atmosphere — it is a "loss" from the soil system (occurs in waterlogged conditions).
- The ozone layer is in the stratosphere (20–35 km altitude), not the troposphere.
Mains frameworks:
- Climate change: carbon cycle science → enhanced greenhouse effect → IPCC assessments → Paris Agreement → India's NDC
- Water crisis: hydrological cycle disruption → groundwater depletion → JJM → Namami Gange
- Soil degradation: soil formation → erosion causes → desertification → India's LDN target
Practice Questions
Q1 (Prelims 2022): With reference to the nitrogen cycle, consider the following statements about denitrification… (Tests understanding of nitrogen cycle steps and bacteria involved)
Q2 (Prelims 2019): In the context of the carbon cycle, which of the following is/are considered a carbon sink? (Oceans, forests, soil organic matter — all are carbon sinks)
Q3 (Mains GS3 2021): Discuss the impacts of climate change on glaciers in the Hindu Kush Himalayan region and its implications for water security in India. Water cycle science → glacier melt → disrupted hydrology → policy response
Q4 (Mains GS3 2019): What is the significance of the Pradhan Mantri Krishi Sinchayee Yojana (PMKSY)? Explain how it can help in conservation of water. Water cycle → irrigation efficiency → PMKSY → water conservation
