Agriculture's Environmental Footprint — Climate, Soil & Water Nexus

Agriculture is simultaneously the most essential and one of the most ecologically disruptive human activities. It feeds over 8 billion people while driving deforestation, groundwater depletion, soil degradation, and significant greenhouse gas emissions. For India — where agriculture employs roughly half the workforce and contributes to 14–18% of national GHG emissions — understanding this environmental footprint is critical both for UPSC and for policy design.

1. Agriculture and Climate Change — The Two-Way Relationship

Agriculture is both a driver and a victim of climate change. This bidirectional relationship is central to understanding food security and climate policy.

Global vs India GHG Contributions from Agriculture

According to IPCC AR6 (Working Group III, 2022), the Agriculture, Forestry and Other Land Use (AFOLU) sector accounted for approximately 22% (13 GtCO2-eq) of total global net anthropogenic GHG emissions in 2019. Of this, managed agriculture (excluding forestry) contributes around 13–21% depending on the accounting methodology.

India's picture is sharper: as per India's 4th Biennial Update Report (BUR-4) submitted to UNFCCC (2024), the agriculture sector contributed 13.72% of India's total GHG emissions (based on 2020 data), down slightly from 14% in the 3rd BUR (2016 data). In absolute terms, agricultural emissions continue to rise even as the share declines due to faster growth in the energy sector.

2. Greenhouse Gases from Agriculture

The three primary GHGs from farming are methane (CH4), nitrous oxide (N2O), and carbon dioxide (CO2), each with distinct sources and potencies.

Within India's agricultural GHG inventory (BUR-3, 2016 data):

Methane from Enteric Fermentation

India holds the world's largest bovine population — approximately 302.79 million bovines (cattle, buffalo, mithun, and yak) as per the 20th Livestock Census (DAHD 2022). India accounts for 57% of the world's buffalo population and roughly 13% of global bovine cattle. Ruminants release methane during digestion (enteric fermentation) — a significant source that is difficult to mitigate without altering feed composition or breeding practices.

India and the Global Methane Pledge: India has not signed the Global Methane Pledge (launched at COP26, 2021 by the EU and USA — committing to a collective 30% reduction in methane from 2020 levels by 2030; 159 countries signed as of April 2025). India is the world's third-largest methane emitter (approximately 31 million tonnes/year). The 2025 Global Methane Status Report highlighted that India does not include agriculture methane action in its NDC commitments, despite agriculture being the dominant methane source. India promotes methane reduction through NMSA via techniques like SRI and Direct Seeded Rice (DSR) — which can cut CH4 by 30–98% — but without a formal pledge commitment.

Methane from Rice Paddies

Rice paddies are anaerobic environments where organic matter decomposes under waterlogged conditions, producing methane via methanogenic bacteria. India's paddy cultivation area reached a record ~49–51 million hectares in 2024-25, making it one of the world's largest sources of agricultural methane.

Alternate Wetting and Drying (AWD): A proven mitigation technique — fields are allowed to dry partially between irrigation cycles, reducing anaerobic conditions and cutting CH4 emissions by 30–70% without significant yield loss. Promoted by the International Rice Research Institute (IRRI).

Nitrous Oxide from Fertilizers

N2O is produced through nitrification and denitrification of nitrogen in soil. With India consuming over 33.5 million tonnes of urea annually (2023-24), and total fertilizer consumption at ~60.1 million tonnes, soil N2O emissions represent a large and growing problem. N2O has a GWP of 273 (IPCC AR6, 100-year) and an atmospheric lifetime of over 100 years.

3. Stubble Burning — Delhi's Winter Crisis

Stubble burning is the practice of burning paddy straw after harvest to quickly clear fields before the next sowing season. It is concentrated in Punjab and Haryana and is a major contributor to Delhi's severe winter air pollution (October–November).

Why farmers burn: The extremely short window between paddy harvest and wheat sowing — only 10 to 15 days in Punjab and Haryana — leaves little time for mechanical disposal. Burning is fast, cheap, and clears fields of pests and weeds simultaneously.

Alternatives to Stubble Burning

The Crop Residue Management (CRM) scheme under the Ministry of Agriculture provides 50% subsidy on farm machinery for in-situ management of crop residue to individual farmers and 80% subsidy to custom hiring centres.

4. Agriculture and Water Pollution

Chemical Fertilizers and Eutrophication

Excess nitrogen from synthetic fertilizers leaches into groundwater and runs off into water bodies, causing eutrophication — the excessive growth of algae that depletes dissolved oxygen, creating dead zones (hypoxic zones). The Maximum Contaminant Level (MCL) for nitrates in drinking water is 10 mg/L (WHO standard); many agricultural groundwaters in Punjab, Haryana, and UP exceed this threshold.

Pesticides — Bioaccumulation and Endocrine Disruption

Pesticides undergo biomagnification — concentration increases up the food chain (e.g., DDT concentrating in fish, birds, and human tissue). Although DDT was banned in India for agricultural use in 1989 (retained for malaria vector control), newer pesticides including neonicotinoids are implicated in bee colony collapse disorder, threatening pollination services worth billions.

The Punjab Cancer Belt — A Case Study

The Malwa region of Punjab (districts: Mansa, Sangrur, Bathinda, Muktsar, Faridkot, Moga, Firozpur) has become synonymous with India's agrochemical crisis.

The Bhatinda–Jodhpur Express (popularly called the "Cancer Train") departs Bathinda every night — approximately 60% of its ~300 passengers are cancer patients travelling to the Acharya Tulsi Regional Cancer Hospital in Bikaner, Rajasthan. Studies link the cancer epidemic to heavy pesticide residues in groundwater, heavy metals (arsenic, uranium), and contamination of the food chain.

5. Monoculture and Soil/Water Degradation — The Green Revolution's Cost

The Green Revolution of the 1960s–70s dramatically increased food production but imposed severe long-term ecological costs, particularly in Punjab and Haryana.

Punjab's groundwater crisis is acute: farmers who once pumped from 5–10 feet depth now drill to 200–300 feet. The state overdraws groundwater by 45% more than annual recharge from rainfall.

Soil Health Card Scheme (launched 2015): Under this scheme, farmers receive soil health cards testing 12 parameters (pH, EC, organic carbon, N, P, K, S, Zn, Fe, Cu, Mn, B) to guide balanced fertiliser application. As of 2024, over 23 crore soil health cards have been distributed.

6. Deforestation for Agriculture

7. Sustainable Agriculture Solutions

A suite of farming systems and techniques can decouple food production from environmental degradation.

8. India's Policy Response

Cross-paper relevance

• GS3 — Environment (primary) — Agriculture's environmental footprint: greenhouse gas emissions (methane from paddy, N₂O from fertilisers), water use, soil degradation, pesticide runoff
• GS3 — Agriculture — Sustainable agriculture: natural farming (ZBNF), organic certification, agroforestry, climate-smart agriculture; PM Pranam scheme (fertiliser reduction)
• GS2 — Policy: National Mission for Sustainable Agriculture (NMSA); Climate-Smart Agriculture pilots; WTO Agreement on Agriculture — subsidy-environment nexus
• Essay — "Feeding the world sustainably is the greatest technological challenge of our era" (recurring)

Recent Developments (2024–2026)

PM-PRANAM — Why State Incentives Alone Won't Fix Fertiliser Overuse

(PM-PRANAM — launched June 2023, 50% subsidy savings returned as grant to states, 15.14 lakh tonne reduction in 2023-24 — is covered in the India's Policy Response table above. This section analyses why the scheme's design faces a structural limitation.)

Chemical fertiliser consumption in India grew from approximately 12 kg/hectare in 1971 to over 170 kg/hectare in 2023 (MoA data), making India the world's second-largest consumer of nitrogenous fertilisers after China. Nitrogen constitutes ~60% of total NPK consumption, and excess nitrogen drives three interconnected environmental harms: soil acidification (pH decline), groundwater nitrate contamination (exceeding 45 mg/L MCL in 27 states per CGWB 2024), and N₂O emissions (GWP 273 × CO₂, IPCC AR6).

Implementation failure — zero disbursals as of March 2026: Despite three years of the scheme's operation and 14 states demonstrating a 1.51 million tonne reduction in fertiliser use in 2023-24 (generating over ₹800 crore in potential subsidy savings), the Centre had released no incentive funds to any state as of March 2026 (Down to Earth investigation). The incentive disbursal mechanism was approved in guidelines but not operationalised. This is a significant governance gap: a scheme premised on performance incentives that are never paid sends a signal that the incentive architecture is non-credible.

The incentive alignment problem: PM-PRANAM incentivises state governments to reduce fertiliser subsidy claims — but fertiliser consumption decisions are made by individual farmers. States can change procurement patterns and promote biofertilisers through extension services, but cannot compel farmers to reduce urea application while paddy-wheat MSP incentives reward maximum yield, and while urea is capped at ₹242/bag regardless of soil nitrogen status.

The nano fertiliser opportunity: Nano urea (IFFCO, launched 2021; price ₹240/500 ml bottle replacing one 50-kg urea bag) can potentially cut nitrogen application by 50% while maintaining yield. PM-PRANAM's 2024-25 expansion explicitly includes nano fertiliser adoption targets — but nano fertiliser's agronomic efficacy is still debated in independent peer-reviewed literature (ICAR's field trials show variable results across soil types).

UPSC angle: PM-PRANAM's incentive gap, nano fertiliser potential and efficacy debate, the 170 kg/ha growth trajectory, and the state-vs-farmer principal-agent mismatch are Mains GS-3 analytical depth points.

Ethanol Blending — 20% Target Achieved 2025

India's ethanol blending in petrol programme made major progress in 2024–25. The blending percentage crossed 15% in the Ethanol Supply Year (ESY) 2023–24, and by July 2025, India achieved 19.93% blending — effectively reaching the 20% target (E20) originally set for 2030, five years ahead of schedule.

During ESY 2023–24, approximately 545 crore litres of ethanol were blended. Since ESY 2013–14, the programme has saved approximately ₹1.36 lakh crore in forex through reduced petrol imports, paid ₹1.18 lakh crore to farmers for sugarcane and grain, and cut approximately 698 lakh tonnes of CO₂ emissions. Sugarcane (C-heavy molasses) remains the primary ethanol source; grain-based ethanol from damaged grains and surplus rice is also utilised.

UPSC angle: Ethanol blending achievements (20% by 2025), benefits (forex saving, farmer income, CO₂ reduction), feedstocks, and the policy framework (National Biofuel Policy 2018 and 2022 amendment) are high-priority Prelims and Mains facts.

National Natural Farming Mission — Scaling ZBNF Beyond Andhra Pradesh

(ZBNF methodology — Jeevamrit, Beejamrit, AP APCNF model, 2.31 lakh SHGs, 80 lakh hectare target — is covered in the Sustainable Agriculture Solutions table above. This section covers the 2024-25 national mission scale-up and its implementation challenges.)

The National Natural Farming Mission (NNFM), announced in Union Budget 2024–25 with an allocation of ₹2,481 crore over three years, targets converting one crore farmers to natural farming practices, beginning with the Ganga corridor (land abutting major rivers). This represents a qualitative shift from PKVY (organic certification–based) to ZBNF (no-external-input farming).

What scales and what doesn't: AP's APCNF success rests on an intensive state-level extension network (Rythu Sadhikara Samstha, trained community resource persons in every GP) that took years to build. NNFM's central government model lacks this ground-level infrastructure — the scheme relies on Krishi Vigyan Kendras (KVKs) and self-help groups, which have much lower farmer-contact intensity. A 2024 ICAR pilot found natural farming reduced input costs by 40–60% for smallholders, but yield stability was highly variable — context-dependent on soil organic matter baseline, water availability, and the specific crop.

The land-abutting-Ganga framing is significant: prioritising river-corridor farms directly addresses chemical runoff into river systems and aligns natural farming with Namami Gange river pollution reduction goals.

UPSC angle: NNFM ₹2,481 crore Budget 2024-25, one crore farmer target, AP-vs-national extension infrastructure gap, Ganga corridor prioritisation, and natural farming's water quality co-benefit are Mains GS-3 analytical depth points.

Exam Strategy

For Prelims:

• Remember India's agriculture GHG share: 13.72% (BUR-4, 2024 data)
• N2O GWP = 273 (IPCC AR6); CH4 GWP = 27.9 (AR6) — note these differ from older AR4/AR5 values
• PKVY launched 2015; PM-KUSUM launched 2019; PM-PRANAM launched June 2023
• Global Methane Pledge — launched COP26 (2021); 30% reduction by 2030; India has NOT signed; 159 countries signed (April 2025)
• India = third-largest methane emitter globally (~31 MT/year); agriculture is dominant source; no agriculture methane action in India's NDC
• PUSA Bio-Decomposer — developed by ICAR-IARI using 4 Trichoderma fungal species
• Punjab water table depletion rate: 59 cm/year in central Punjab (critical blocks)
• "Cancer Train" runs from Bathinda to Bikaner (Rajasthan); Malwa cancer incidence ~136/lakh
• PM-PRANAM governance gap: 14 states reduced fertiliser use by 1.51 MT in 2023-24; ₹0 disbursed to states as of March 2026

For Mains (GS Paper 3):

• Structure answers on "agriculture and environment" around the three pillars: GHG emissions (climate), water (pollution + depletion), and soil (health + biodiversity)
• When asked about stubble burning, always cover: why it happens (10–15 day window), alternatives (Happy Seeder, PUSA Bio-Decomposer, AWD), and policy (CRM scheme)
• Link ZBNF/organic farming to both environmental benefits (soil carbon, reduced GHG) and economic aspects (lower input costs, premium markets)
• The Green Revolution's legacy question should cover: water table crisis + monoculture + soil degradation + Punjab cancer belt as interconnected outcomes of input-intensive farming