Rice is a miracle grain that keeps billions alive—and a quiet accelerant of the climate crisis the world can no longer ignore. The question now is not whether we can give up rice, but whether we have the political courage and practical imagination to grow it differently.
Rice is the daily calorie backbone for roughly half of humanity, especially across Asia and Africa. Yet the way we typically grow it—flooded paddies, season after season—turns vast landscapes into methane factories.
Understanding water, rice fields become oxygen-starved; microbes break down organic matter and release methane, which rice plants then ferry into the atmosphere through their tissues. Methane has a far shorter lifetime than carbon dioxide but a much higher warming punch, especially over a 20‑year period, making it a prime target for rapid climate action. Studies estimate that rice cultivation is responsible for around 10–12% of human-made methane emissions, and roughly half of all greenhouse gases from croplands.
This is the uncomfortable truth: the very system that lifted millions out of hunger is now deepening climate risks that will, in turn, destabilize food security.
How paddies emit methane
The problem is not rice itself, but the production model we have normalized. Continuous flooding keeps soils anaerobic for weeks on end, ideal conditions for methanogenic bacteria. Add crop residues, manures, or other organic inputs, and you feed the microbes that pump methane into the air.
Researchers have shown that relatively simple shifts in water and nutrient management can dramatically curb these emissions. Alternate wetting and drying (AWD)—periodically letting fields drain before re-flooding—supplies oxygen to the soil and suppresses methane formation, while often saving irrigation water. Hybrid and improved rice varieties with shorter growing periods and better nitrogen use can further cut emissions by reducing how long fields stay flooded and how much fertilizer they require.
The science is clear: we already have a toolbox to tame rice’s methane footprint. The politics, economics and institutions are far murkier. That tension is visible in two telling national stories—India and Vietnam.
India’s cautious transition
India is one of the world’s largest rice producers, with more than 51 million hectares under paddy cultivation. Flooded rice fields are also a major slice of the country’s climate problem: India’s own reporting estimates that paddy cultivation emitted around 3.2 million tonnes of methane in 2020, roughly 23% of its agricultural methane emissions.
Yet when the Global Methane Pledge—a voluntary commitment to cut methane 30% from 2020 levels by 2030—was launched, India declined to sign. In a written explanation to Parliament, the government argued that methane from paddy and livestock are “survival emissions” from small and marginal farmers, unlike the “luxury emissions” of industrial agriculture in rich countries. It stressed that its Paris Agreement commitments are economy‑wide, not gas‑ or sector‑specific.
This framing is not just diplomatic spin; it reflects real political economy. Millions of Indian farmers rely on water‑intensive, heavily subsidized rice; telling them to change practices—or crops—without robust safety nets is unfair. But the danger of overplaying the “survival emissions” argument is paralysis: if everything is survival, nothing can change.
To its credit, India is not simply defending the status quo. Under the National Mission for Sustainable Agriculture, the government promotes climate‑resilient practices that also lower methane, including better water management in rice. The Indian Council of Agricultural Research, through the NICRA programme, has developed and tested several mitigation options. System of Rice Intensification (SRI) techniques have boosted yields by 36–49% while cutting water use by about 22–35% compared with conventional transplanted rice. Direct seeded rice (DSR), which sows seeds directly into fields without puddling and standing water, avoids continuous flooding altogether and can sharply reduce methane. Crop diversification schemes push farmers to shift some paddy area to pulses, oilseeds and agroforestry, effectively avoiding methane emissions where rice is not strictly necessary.
These are not fringe experiments. They are being scaled through Krishi Vigyan Kendras and national schemes, and recent analysis suggests that DSR can cut methane emissions by up to 40% and AWD by 30–70% under the right conditions, while saving water and sometimes costs. Yet adoption remains patchy, held back by risk aversion, lack of assured procurement for alternative crops, delayed subsidies and thin extension services.
India’s stance today is a study in ambivalence: it is quietly piloting the very practices that could make deep methane cuts possible, while loudly refusing to bind itself to quantified methane targets. That may be tactically shrewd in climate diplomacy. But domestically, it risks underplaying a hard truth—without transforming rice cultivation, India’s climate goals and its long‑term food security will collide.
Vietnam’s bold experiment
If India embodies cautious gradualism, Vietnam increasingly represents a bolder wager: that low‑emission rice can be a competitive advantage, not just a climate obligation. The Mekong Delta, Vietnam’s rice bowl, has embraced alternate wetting and drying not as a niche practice but as a central plank of national policy.
Research by the International Rice Research Institute (IRRI) and partners showed that AWD can significantly cut methane emissions while reducing irrigation water and maintaining yields. Vietnam’s Ministry of Agriculture and Rural Development took those findings and institutionalized AWD in technical guidelines and in the agricultural component of its national climate commitments (NDC). By 2019, AWD had been scaled across about 180,000 hectares in eleven provinces, avoiding an estimated 1.1 million tonnes of carbon‑dioxide equivalent emissions per year.
Crucially, AWD in the Mekong Delta is not just a climate story; it is a livelihoods story. Year‑round AWD has been shown to increase farmers’ profits by around 6% compared with conventional flooding, thanks to lower water and energy costs. Building on this success, Vietnam has launched an ambitious programme to develop one million hectares of “high‑quality, low‑emission rice” in the Mekong Delta by 2030—a vision that blends contract farming, improved varieties, rice‑straw valorization and water‑saving irrigation into a broader circular economy model.
In other words, Vietnam is treating methane‑efficient rice as industrial strategy. Its low‑emission rice initiative is already drawing interest from neighbours like Cambodia, which recently sent officials on a knowledge‑exchange visit to learn about AWD implementation and the one‑million‑hectare programme. Vietnam’s approach is not perfect—smallholders still face climate shocks, and market premiums for “green rice” are nascent—but it has moved from pilot plots to systemic change much faster than most.
Compare this with the global picture: in many rice‑growing regions, climate‑smart agriculture is still treated as a donor‑funded project rather than core national policy. Vietnam shows that, with the right mix of research, public policy and private investment, low‑emission rice can become a national brand.
The path ahead
What do these two stories tell us? First, technology is not the bottleneck. AWD, DSR, SRI, hybrid rice and other climate‑smart methods have been studied for years; hybrid rice alone has been shown to emit around 19% less methane than traditional inbred varieties under similar conditions, especially when paired with better water and nutrient management. The barriers lie in finance, risk, and trust. Farmers will not gamble their staple crop on new practices without insurance, credit, strong extension, and markets that reward them for lower emissions or higher water productivity.
Second, justice arguments cut both ways. India is right to insist that smallholder “survival emissions” are not morally equivalent to luxury consumption elsewhere. But if climate change makes monsoons erratic, salinizes deltas, and bakes rain‑fed regions, it will be those very smallholders who suffer first. Protecting their livelihoods therefore requires transforming rice systems now, not defending yesterday’s production model.
Third, the world has a stake in helping countries choose the Vietnam path over the path of delay. That means concessional finance for methane mitigation in agriculture, carbon markets that recognize rice‑sector reductions with credible monitoring, and global research partnerships that accelerate diffusion of low‑emission varieties and practices. The collaboration between the Philippine Rice Research Institute and the Philippine Space Agency—using flux towers and satellites to precisely monitor greenhouse gases from rice fields—is one example of the kind of high‑resolution science that can underpin such markets and policies.
Rice will remain on our plates for the foreseeable future; the cultural and nutritional role it plays is too deep to be replaced overnight. The real choice is whether we let rice production continue as a silent driver of warming, or whether we seize it as one of the fastest, fairest ways to bend the methane curve. India’s cautious experiments and Vietnam’s large‑scale transformation sketch two ends of that spectrum.
The rest of the rice‑eating world will decide, in the coming decade, which example to follow—and whether the grain that feeds billions can also help cool the planet that sustains us all.
