India's dominance in rice production carries a significant climate cost. Discuss the drivers of methane emissions from paddy cultivation and suggest mitigation strategies compatible with food security.

Q. India's dominance in rice production carries a significant climate cost. Discuss the drivers of methane emissions from paddy cultivation and suggest mitigation strategies compatible with food security. (15 marks, 250-350 words)

India is the world's largest rice producer, yet flooded paddies are now a major climate liability: global paddy greenhouse-gas emissions have roughly doubled since the 1960s to about 1.1 billion tonnes CO2-equivalent a year [1]. With agriculture contributing nearly three-fourths of India's methane emissions [2], reconciling the rice bowl with climate goals is unavoidable.

Drivers of methane emissions from paddy cultivation - Continuous flooding: standing water creates anaerobic soils where methanogens thrive; irrigated rice accounts for 70–80% of rice-sector methane globally, against roughly 40% of that intensity in rainfed systems [4]. - Area expansion: the single largest contributor to the rise in net paddy emissions worldwide, as cultivation spread into non-traditional tracts [1]. - Residue incorporation: intensified ploughing-in of straw supplies organic substrate for methanogenesis [1]. - Soil carbon loss and nitrogen intensification: over a third of paddy soils have flipped from carbon sink to source, adding CO2 and nitrous oxide to the methane burden [1]. - Agro-ecological concentration: the Eastern Gangetic Plain, with prolonged waterlogging, is a recognised emissions hotspot [4].

Mitigation compatible with food security - Water management: Alternate Wetting and Drying and the System of Rice Intensification, which raises yields 36–49% while using 22–35% less water [2]. - Establishment method: Direct Seeded Rice, which avoids puddling and standing water without sacrificing output [2]. - Crop diversification away from paddy in over-exploited groundwater blocks, as urged in NITI Aayog's Green Revolution to Amrit Kaal review [5]. - Nutrient and residue management: balanced nitrogen use and off-field straw utilisation instead of wholesale incorporation [1]. - Science-led options: ICAR-NRRI's methane-oxidising bacterial formulation from Sundarban mangroves offers a low-cost farm input [3].

Paddy methane is thus a problem of how rice is grown, not how much is grown. Improved management alone can cut net emissions by about 10% without yield loss [1]. Embedding these practices in irrigation pricing, extension and procurement policy would let India honour its climate commitments while safeguarding the food security guaranteed under the National Food Security Act.

(~330 words)

Sources: 1. Global rice paddy greenhouse gas emissions have doubled over the past six decades driven by area expansion and intensified residue incorporation — Nature Food (2026) — 1.1 bn t CO2-e/year, doubling since 1960s, area expansion and residue incorporation as drivers, sink-to-source flip, ~10% mitigation potential without yield loss 2. Measures to Reduce Methane Emissions — PIB, Ministry of Agriculture & Farmers Welfare — agriculture's share of India's methane per the Third Biennial Update Report; SRI yield/water figures; Direct Seeded Rice 3. ICAR-NRRI scientists develop methane-oxidising bacteria formulation from Sundarban mangroves — PIB — indigenous biological mitigation option for paddy methane 4. Hydrologic variability governs GHG emissions in rice-based cropping systems of Eastern India — NCBI/PMC — irrigated vs rainfed methane shares; Eastern Gangetic Plain as hotspot 5. From Green Revolution to Amrit Kaal: Lessons and Way Forward — NITI Aayog — crop diversification away from water-intensive paddy in stressed groundwater regions