In plain terms, greenhouse gases are the gases in the atmosphere, chiefly carbon dioxide, methane, nitrous oxide, water vapour and a family of man-made fluorinated gases, that absorb heat radiating from the Earth and warm the lower atmosphere; India releases them mainly from coal-fired power, farming, industry and transport, which makes it one of the world’s largest emitters in total even though each Indian emits far less than the global average. Updated 4 November 2026, this explainer sets out what each gas is, where India’s emissions come from, how the gases are compared, and what the country has pledged to do about them.
The gases themselves are not a modern invention. A natural blanket of water vapour, carbon dioxide and a few others keeps the planet roughly 33 degrees Celsius warmer than it would otherwise be, which makes it habitable. The problem is the thickening of that blanket. Since the Industrial Revolution, burning coal, oil and gas, clearing forests and intensive farming have pushed concentrations well above anything seen in hundreds of thousands of years, and the planet is heating as a result.
| What they are | Atmospheric gases that absorb outgoing heat and warm the lower atmosphere |
|---|---|
| Main gases | Carbon dioxide, methane, nitrous oxide, fluorinated gases, water vapour |
| India’s biggest source sector | Energy, mainly coal-based electricity and heat, roughly three-quarters of national emissions |
| India’s methane sources | Cattle and buffalo digestion, rice paddies, waste and fossil fuels |
| India’s nitrous oxide source | Mainly nitrogen fertiliser use on farmland |
| India’s global position | Third-largest annual emitter after China and the United States, with a small per-capita figure |
| Per-capita emissions | Less than half the world average |
| Key national goals | Net zero by 2070; 45 percent cut in emissions intensity of GDP by 2030 from 2005 levels |
Key Takeaways
- Greenhouse gases trap heat in the atmosphere; the main ones are carbon dioxide, methane, nitrous oxide, water vapour and man-made fluorinated gases.
- Carbon dioxide causes most human-driven warming, while methane is far more heat-trapping per tonne but stays in the air for a much shorter time.
- Energy, especially coal power, is India’s largest source of emissions, followed by agriculture, industry and waste.
- India is among the world’s top three annual emitters in total but has low emissions per person and a small share of historical emissions.
- Livestock digestion and flooded rice fields make agriculture India’s main methane source, and fertiliser is the main source of its nitrous oxide.
- India has pledged net zero emissions by 2070, a 45 percent cut in emissions intensity by 2030, and about half its power capacity from non-fossil sources by 2030.
What are greenhouse gases and how do they trap heat?
Greenhouse gases are atmospheric gases whose molecules absorb infrared heat given off by the warmed Earth and re-radiate it in all directions, including back toward the surface. Sunlight passes through the atmosphere easily and warms the land and sea. The surface then sends the energy back as infrared radiation, and greenhouse gases intercept part of it.
The main atmospheric gases, nitrogen and oxygen, make up nearly all of the air but are transparent to heat radiation, so they do not warm the planet. Gases with three or more atoms, or with particular molecular structures, vibrate in ways that absorb infrared. That is why a tiny share of the air, measured in parts per million for carbon dioxide and parts per billion for methane and nitrous oxide, has such a large effect.
The natural effect is beneficial; without it the average temperature would be about minus 18 degrees Celsius. The concern is the enhanced effect from added gases. A higher concentration means more heat is held, so the lower atmosphere, oceans and land warm until outgoing radiation again balances incoming sunlight at a higher temperature. The result is not just warmer days but changed rainfall, melting glaciers, rising seas and more extreme weather.
Which are the main greenhouse gases?
The main greenhouse gases are carbon dioxide, methane, nitrous oxide and the fluorinated gases, along with water vapour, which acts mostly as an amplifier of warming rather than an independent cause. Each differs in source, strength and lifetime in the air.
Carbon dioxide comes mainly from burning coal, oil and gas, from cement making and from deforestation. Its concentration has risen from about 280 parts per million before industrialisation to well above 420 parts per million today. It lingers for centuries, so the cumulative total matters. Methane comes from livestock, wetlands, rice paddies, landfills, coal mines and oil and gas systems. It is a much more potent heat trapper per molecule but breaks down in roughly a decade.
Nitrous oxide comes mainly from nitrogen fertilisers, manure and some industrial processes, and persists for over a hundred years. The fluorinated gases, which include hydrofluorocarbons used in air conditioners and refrigerators, sulphur hexafluoride used in electrical equipment and perfluorocarbons from aluminium smelting, exist in small amounts but can be thousands of times more potent than carbon dioxide. Water vapour is the most abundant greenhouse gas, but its amount in the air is controlled by temperature: a warmer atmosphere holds more of it, which strengthens the warming that other gases start.
How are different greenhouse gases compared?
Different greenhouse gases are compared using global warming potential, which expresses how much heat a tonne of a gas traps over a set period, usually 100 years, relative to a tonne of carbon dioxide. The figures let countries add all their emissions into a single carbon dioxide equivalent total.
By the commonly used scientific assessments, methane has a 100-year potential of roughly 27 to 30 times that of carbon dioxide, and over 20 years it is around 80 times, since it acts strongly but briefly. Nitrous oxide is roughly 270 times as potent over 100 years. Some fluorinated gases are in the thousands, and sulphur hexafluoride is in the tens of thousands. The exact numbers change a little with each scientific report, so they are best treated as approximate.
This comparison explains why cutting a modest tonnage of methane or hydrofluorocarbons can deliver fast benefits for the climate. Reducing methane, in particular, can slow warming within a few decades, whereas carbon dioxide cuts pay off over a longer time because of the gas’s long life. A sound climate plan therefore targets both: deep, steady reductions in carbon dioxide for the long run and quicker cuts in short-lived gases for the near term.
| Gas | Main Indian sources | Approximate lifetime in air | Heat trapping versus carbon dioxide (100 years) |
|---|---|---|---|
| Carbon dioxide | Coal power, industry, transport, cement | Centuries (persists in parts) | 1 |
| Methane | Livestock, paddy fields, waste, coal mines | About a decade | Roughly 27 to 30 times |
| Nitrous oxide | Fertiliser, manure | Over a hundred years | Roughly 270 times |
| Hydrofluorocarbons | Air conditioners, refrigeration | Years to decades | Hundreds to thousands of times |
| Sulphur hexafluoride | Electrical switchgear | Thousands of years | Tens of thousands of times |
Where do India’s greenhouse gas emissions come from?
India’s greenhouse gas emissions come mostly from the energy sector, followed by agriculture, industrial processes and waste. In national inventories submitted to the United Nations climate body, energy accounts for roughly three-quarters of the total, agriculture for a bit over a tenth, industrial processes for under a tenth and waste for a small share, with forests acting as a partial offset.
Within energy, the single biggest contributor is electricity generation, since coal still supplies roughly three-quarters of India’s power. Industry uses coal directly for steel, cement, fertiliser and other heavy products. Transport relies heavily on petrol and diesel, and its share has been rising with vehicle ownership. Households add emissions through cooking fuels, lighting and cooling, though the average household uses far less energy than in rich countries.
Because the figures come from official inventories compiled with a lag of a few years, and because estimates can vary between agencies, exact percentages are best read as broad indications. The picture that holds across studies is that a few sectors, coal power above all, dominate and so offer the biggest levers for change. Indian cities, with their traffic, construction and waste, add a growing urban footprint on top of this.
How do farming and livestock add to India’s methane and nitrous oxide?
Farming and livestock add to India’s emissions mainly through methane from the digestion of cattle and buffalo and from flooded rice fields, and through nitrous oxide from nitrogen fertiliser applied to the soil. India has one of the world’s largest herds, and enteric fermentation, the methane released when ruminant animals digest food, is the largest single source of its methane.
Paddy cultivation is the second big contributor. When rice fields are flooded, oxygen-poor conditions allow microbes to produce methane, which bubbles up through the water. Management matters a great deal: continuous flooding produces more methane, while practices such as alternate wetting and drying, direct seeded rice and the System of Rice Intensification can cut it substantially while saving water. Burning crop residue, a practice common in the north-west each autumn, releases carbon dioxide, methane and black carbon in addition to harming air quality.
Nitrous oxide arises when microbes process nitrogen fertiliser, especially when too much is applied. India is one of the largest users of fertiliser in the world, much of it urea that is heavily subsidised, and over-application is common. Nutrient management through soil health cards, neem-coated urea, nano-fertilisers and balanced use can lower both costs and emissions. Better feed and breeding for more productive animals can reduce methane per litre of milk. These measures make farm emissions a rich area for low-cost mitigation.
How does India compare with the rest of the world?
India ranks as the third-largest annual emitter of greenhouse gases after China and the United States, accounting for roughly 7 percent of global emissions, but its emissions per person are less than half the world average. The apparent contradiction is explained by its large population of over 1.4 billion.
A person in India emits on the order of two tonnes of carbon dioxide each year, compared with several times that in China and many times that in the United States. India’s share of cumulative historical emissions since the Industrial Revolution is also small, a few percent, because it industrialised late and kept low-energy lifestyles for much of its population. These facts underpin India’s argument that developed countries should bear a greater responsibility for cutting emissions and for financing climate action, a principle often described as common but differentiated responsibilities.
Even so, India’s total emissions are rising because its economy and energy demand are growing quickly, and its choices over coming decades will matter for the global total. Projections that the world must reach net zero around mid-century to stabilise warming cannot be met without India’s participation. The challenge is to expand energy access, jobs and growth while avoiding a long lock-in to fossil fuels.
What has India promised to do about its emissions?
India has pledged to reach net zero emissions by 2070, to cut the emissions intensity of its GDP by 45 percent by 2030 from 2005 levels, and to have about half of its installed electric power capacity from non-fossil sources by 2030. These commitments were announced at the 2021 Glasgow climate summit and later reflected in India’s updated national climate plan submitted in 2022.
The package, sometimes called the Panchamrit, also included a target of 500 gigawatts of non-fossil electricity capacity by 2030, meeting half of energy requirements from renewable sources by the same year, and a reduction of projected emissions by one billion tonnes by 2030. A related goal is to create an additional carbon sink of roughly 2.5 to 3 billion tonnes of carbon dioxide equivalent through forest and tree cover by 2030. India reported cutting its emissions intensity by roughly a third between 2005 and 2019, so it was already part of the way to its intensity goal.
Intensity targets differ from absolute caps: they allow total emissions to grow as long as they grow more slowly than the economy. Critics argue that this may not be enough to meet global temperature goals, while supporters note that India’s per-capita emissions are low and that it is growing its solar and wind capacity at a rapid pace. It has also ratified the Kigali Amendment to phase down hydrofluorocarbons, with reductions beginning later this decade, and has not joined the Global Methane Pledge.
Which policies and technologies are cutting greenhouse gases in India?
Policies and technologies cutting India’s greenhouse gases include rapid growth in solar and wind power, efficiency programmes, electric mobility, green hydrogen plans, a domestic carbon market under development and forest expansion. These work on different parts of the emissions picture, from power to transport to land.
Solar and wind capacity has grown rapidly, helped by auctions that pushed down prices and by large solar parks in Rajasthan, Gujarat and elsewhere. Efficiency schemes distributing LED bulbs, star-labelled appliances and energy-saving standards for buildings reduce demand for electricity. The government has promoted electric vehicles, ethanol blending in petrol and compressed biogas, and set up a National Green Hydrogen Mission to decarbonise industry such as fertiliser and steel. The Perform, Achieve and Trade scheme encourages energy-intensive firms to improve efficiency, and a national carbon credit trading scheme has been planned.
On the land side, afforestation, tree planting and restoration programmes aim to increase the carbon sink. For methane, there are programmes for biogas and better manure management, and for paddy there are pilots of low-methane rice farming. The pace of change depends heavily on finance, grid upgrades and the future of coal, which still supplies the bulk of electricity and employs many people in mining regions, making a just transition for workers an important question.
What can individuals and communities do?
Individuals and communities can cut greenhouse gases by using energy more efficiently, shifting to cleaner transport, reducing food and material waste and supporting local renewable and tree-planting efforts. Individual choices are small compared with national systems, but together they shape demand and policy.
At home, efficient appliances, higher air-conditioner thermostat settings around 24 to 26 degrees Celsius, rooftop solar and solar water heaters reduce electricity use. For travel, walking, cycling, public transport, metro systems and shared rides cut the use of petrol and diesel. In the kitchen, wasting less food avoids the methane released when food rots in landfills, and composting keeps organic waste out of dumps. Mission LiFE, the national campaign for sustainable lifestyles, encourages exactly these habits.
Communities can invest in biogas plants, protect and restore local green cover and demand better public transport and waste segregation from their local bodies. Farmers can adopt water-saving paddy methods and balanced fertiliser doses. None of these steps is a substitute for large-scale change in power and industry, but they build awareness and a constituency for stronger action.
Bottom Line
Greenhouse gases are the reason the planet is warming, and India’s role is paradoxical: it is a large total emitter because of its size, yet its per-person and historical emissions are low. Coal power, livestock, paddy, fertiliser and industry are the main sources, and clean power, efficiency, smarter farming and forest cover are the main levers. How India grows over the coming decades will help decide the planet’s climate.
Frequently Asked Questions
What are the main greenhouse gases?
The main greenhouse gases are carbon dioxide, methane, nitrous oxide, water vapour and the man-made fluorinated gases. Carbon dioxide drives most of the human-caused warming.
What is India’s biggest source of greenhouse gas emissions?
The energy sector is the largest source, mainly coal-fired electricity and heat. Agriculture, industrial processes and waste make up most of the rest.
Why is methane important for India?
India has a very large cattle and buffalo population and extensive flooded rice fields, both major methane sources. Methane traps much more heat per tonne than carbon dioxide, though it breaks down within about a decade.
Is India the largest emitter of greenhouse gases?
No. India is the third-largest annual emitter after China and the United States, and its emissions per person are well below the world average.
What is India’s net zero target?
India has committed to reach net zero emissions by 2070. Its near-term goals include cutting emissions intensity by 45 percent by 2030 from 2005 levels and getting about half of installed power capacity from non-fossil sources.
What is global warming potential?
It is a measure of how much heat a tonne of a gas traps over a period, usually 100 years, compared with a tonne of carbon dioxide. It lets different gases be added into a single carbon dioxide equivalent figure.
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