🗞️ Why in News
A global assessment published in the journal Nature Food in 2026, and highlighted again in current reporting, found that India’s flooded, irrigated paddy (rice) fields, together with declining soil-carbon storage, are among the world’s largest methane emission hotspots. The finding sharpens a difficult policy question for India: how to safeguard food security from its staple crop while curbing one of the most potent drivers of near-term global warming.
Why Rice and Methane Are Linked
Paddy is not like other crops. To control weeds and stabilise yields, farmers keep fields continuously flooded for much of the season. That standing water starves the soil of oxygen, creating anaerobic conditions in which methanogenic bacteria thrive, breaking down organic matter and releasing methane (CH4) into the atmosphere. The longer the field stays flooded and the richer it is in organic residue, the more methane it emits.
The Scale of the Problem
| Indicator | Figure |
|---|---|
| India’s annual methane from irrigated paddy | About 3 to 4 million tonnes |
| Growth in global paddy greenhouse-gas emissions since the 1960s | Nearly doubled |
| Global paddy emissions (2011-2020) | About 1.1 billion tonnes of CO2-equivalent |
| Projected rise by 2050 | About 26 per cent |
| Methane’s warming potential vs CO2 (100-year) | Around 28 to 34 times |
Methane is a short-lived climate pollutant. It persists in the atmosphere for only about a decade, far shorter than carbon dioxide, but it traps heat far more aggressively while it lasts. That makes it both the second-largest contributor to warming after CO2 and, crucially, a lever for fast climate action: cutting methane now buys time by slowing warming within a human generation.
Why India Sits at the Centre
India is among the world’s largest rice producers and consumers, and rice underpins the food security of hundreds of millions. The study’s warning about declining soil-carbon storage compounds the concern, because healthy soils that lock away carbon are being depleted even as emissions rise. The result is a double penalty: more greenhouse gas released and less carbon retained in the ground.
Mitigation: Doing More Rice with Less Water and Less Methane
The encouraging news is that proven, field-tested techniques can cut methane sharply without sacrificing yield.
Alternate Wetting and Drying (AWD)
Instead of keeping fields permanently flooded, farmers let the water level fall and periodically re-flood. These intermittent dry spells reintroduce oxygen, suppressing methanogenic activity. AWD can cut methane substantially while also saving irrigation water, a co-benefit in water-stressed states.
Direct Seeded Rice (DSR)
Seeds are sown directly into the field rather than raised in nurseries and transplanted into standing water. DSR reduces the flooded period, lowers water and labour use, and shrinks the methane window.
System of Rice Intensification (SRI)
SRI uses younger seedlings, wider spacing and controlled, non-continuous irrigation, boosting yields per plant while keeping soils largely aerobic.
The Policy Trade-off
The core tension is between food security and emissions. Farmers flood fields because it is a reliable, low-risk way to protect their harvest, so any transition must incentivise water-saving methods rather than penalise cultivators. This aligns with the Global Methane Pledge, under which signatory countries aim to cut collective methane emissions 30 per cent by 2030 from 2020 levels. For India, the pathway lies in climate-smart agriculture: linking AWD, DSR and SRI adoption to credit, procurement incentives and extension support, while protecting yields and farmer incomes.
UPSC Relevance
GS Paper 3: Conservation, environmental pollution and degradation; climate change; agriculture, cropping patterns and issues of food security.
Prelims pointers:
- Methane (CH4) is a short-lived climate pollutant with a global warming potential around 28 to 34 times that of CO2 over 100 years.
- India’s irrigated paddy emits roughly 3 to 4 million tonnes of methane annually.
- Alternate Wetting and Drying (AWD), Direct Seeded Rice (DSR) and the System of Rice Intensification (SRI) are key methane-mitigation methods.
- The Global Methane Pledge targets a 30 per cent cut in methane by 2030 from 2020 levels.
- The study appeared in Nature Food.
Mains question: India’s rice economy is central to both food security and climate mitigation. Discuss the trade-offs and suggest a climate-smart pathway to reduce methane emissions from paddy cultivation. (250 words)
📌 Facts Corner, Knowledgepedia
- Methane is generated in paddy fields by methanogenic bacteria under anaerobic (oxygen-starved) flooded conditions.
- Agriculture and paddy are major sources of India’s methane, alongside enteric fermentation in livestock and waste.
- The Global Methane Pledge was launched at the COP26 climate summit in Glasgow (2021).
- Because methane is short-lived, cutting it delivers rapid climate benefit compared with long-lived CO2.
- India also runs schemes such as Per Drop More Crop under PMKSY that support water-efficient farming, complementing methane-reduction goals.
Sources: Nature Food, global paddy emissions assessment, Down To Earth, India paddy methane hotspots, Global Methane Pledge
Source: India's Paddy Fields Emerge as Global Methane Hotspots — Ujiyari.com | Free UPSC & State PCS Current Affairs
