Global Warming and India Explained

Global warming is the long-term rise in the average temperature of the Earth’s surface, atmosphere and oceans, driven mainly by the heat-trapping gases that people add to the air by burning fossil fuels, clearing forests and farming. The planet has warmed by a little over one degree Celsius since the late nineteenth century, and the pace has quickened in recent decades. The term is often used interchangeably with climate change, but strictly it refers to the temperature rise itself, while climate change covers all the knock-on shifts in rain, storms, ice and sea level.

For India, global warming is not a distant forecast. It shows up in hotter springs, longer heatwaves, heavier cloudbursts, melting Himalayan ice and rising seas along a long coast. This explainer, last reviewed 4 November 2026, sets out what the evidence says, how it is playing out across the subcontinent and what India is promising to do about it.

Quick Facts: Global Warming at a Glance

Key Takeaways

• Global warming is the measured, human-driven rise in the Earth’s average temperature, now a little over one degree Celsius above the late nineteenth century.
• India has warmed less than many land regions so far, roughly seven-tenths of a degree Celsius over the last century, but heat extremes, humid heat and heavy-rain events are rising.
• The Indian monsoon has not simply weakened or strengthened: its seasonal total shows large natural swings, while its rain is increasingly delivered in short, intense bursts with longer dry gaps between them.
• Himalayan glaciers and snow are shrinking in many places, threatening dry-season flows in rivers that sustain hundreds of millions of people, and sea levels are rising along India’s coasts.
• India’s emissions per person remain well below the world average, but its total is large and growing, which makes the pace of its energy transition important for the planet.
• India has pledged net-zero emissions by 2070 and is building large solar and wind capacity, while also investing in adaptation such as heat action plans and early warning systems.

What causes global warming?

Global warming is caused mainly by an increase in greenhouse gases in the atmosphere that thicken the natural heat-trapping blanket around the Earth. Carbon dioxide from burning coal, oil and natural gas is the biggest contributor, joined by methane from livestock, rice paddies, landfills and fossil fuel leaks, and by nitrous oxide from fertilisers. Deforestation adds to the problem by releasing stored carbon and by removing trees that would absorb it.

Natural factors such as changes in the Sun’s output, volcanic eruptions and cycles like El Nino cause year-to-year and decade-to-decade wobbles, but they cannot explain the sustained rise since the 1800s. Measurements show that the Sun’s output has been roughly flat or slightly declining in recent decades while temperatures climbed. The upper atmosphere has cooled even as the lower atmosphere has warmed, which is exactly the signature expected from trapped heat rather than from a brighter Sun. The Intergovernmental Panel on Climate Change, whose assessments draw on thousands of studies, has stated in its sixth report that it is unequivocal that human influence has warmed the atmosphere, ocean and land.

For a deeper look at the physics of heat trapping, see the companion explainer on the greenhouse effect.

How much has the Earth warmed so far?

The Earth has warmed by roughly 1.1 to 1.3 degrees Celsius compared with the late nineteenth century, and the last decade has been the warmest on record. Several independent teams, including those at NASA, the UK Met Office, the US National Oceanic and Atmospheric Administration and the European Copernicus service, track global temperatures using thousands of land stations, ships, buoys and satellites. They reach the same broad conclusion even though methods differ in detail.

Land warms faster than the ocean, and the polar regions warm faster still. In recent years individual calendar years have approached or briefly crossed 1.5 degrees Celsius above the pre-industrial level, which does not yet mean the long-term Paris threshold has been broken, since that is judged over decades. Oceans have absorbed over 90 percent of the excess heat trapped by greenhouse gases, which is why ocean heat content and sea-level rise continue even when surface temperatures pause for a year or two during a La Nina.

The impacts do not scale evenly. Half a degree can be the difference between a heatwave that is merely harsh and one that is deadly, or between a reef that survives and one that bleaches. That is why the 1.5 and 2 degree thresholds in the Paris Agreement attract so much attention.

How much has India warmed?

India’s average temperature has risen by roughly 0.7 degrees Celsius over the twentieth century and early twenty-first, according to the national assessment of climate change over the Indian region published by the Ministry of Earth Sciences. This is less than the global land average, partly because a layer of aerosol pollution over the subcontinent has reflected some sunlight and masked part of the warming, and partly because the monsoon and irrigation exert a cooling influence.

Underneath the average lies a more worrying picture. Hot days and hot nights have become more frequent, cold nights fewer, and the surface of the tropical Indian Ocean has warmed by about a degree or so over the past half century. The warming has not been uniform, with some regions such as parts of the northwest, the Himalaya and the cities heating faster than the average. Urban areas also add a heat island effect on top of the regional trend, as concrete, asphalt and sparse greenery hold the day’s heat well into the night.

India’s own scientists at the India Meteorological Department and the Indian Institute of Tropical Meteorology project that by the end of the century, under a high-emission pathway, the average temperature could rise by several degrees, and heatwave frequency could multiply. These are projections rather than certainties, and the actual path depends heavily on how quickly emissions fall.

How is global warming changing India’s heatwaves?

Global warming is making India’s heatwaves hotter, longer and more frequent, and it is also bringing them earlier in the year. The record-breaking heat of March and April 2022 across northwest and central India and Pakistan is a clear example, and an attribution study by the World Weather Attribution group concluded that climate change made such an event many times more likely than it would otherwise have been.

The danger is not only the dry bulb temperature on a thermometer. Heat combined with high humidity, common along the coasts and in the Gangetic plain before the monsoon, reduces the body’s ability to cool itself by sweating. Researchers use a measure called the wet-bulb temperature to capture this combined stress, and parts of India are projected to approach dangerous levels more often later this century. Outdoor workers in construction, agriculture, brick kilns and street vending are the most exposed, and the loss of working hours has an economic cost as well as a health one.

Several states and cities, beginning with Ahmedabad, have introduced heat action plans that combine early warnings, cooling shelters, changed working hours and public awareness, and these have been credited with lowering heat deaths in places where they were carried out well.

What is global warming doing to the Indian monsoon?

Global warming is changing the way the Indian monsoon delivers its rain, with the clearest signal being more intense downpours separated by longer dry spells, rather than a simple rise or fall in the seasonal total. The summer monsoon rainfall over India showed a decline of a few percent from the middle of the twentieth century to the early twenty-first, which scientists link to a mix of aerosol pollution, warming of the Indian Ocean and changes in land-sea temperature contrast. In recent years the rainfall has partly recovered, which shows how large natural variability remains.

A warmer atmosphere can hold about seven percent more moisture for each degree Celsius of warming, and that extra moisture is released in the heaviest storms. Studies of central India show a rising trend in extreme daily rainfall events, which is consistent with the more frequent cloudbursts, urban floods and landslides seen in Mumbai, Chennai, Kerala, Uttarakhand and Himachal Pradesh. At the same time the number of moderate rain days has fallen in places, which hurts rainfed crops that depend on steady rain.

Future projections generally suggest that the monsoon will become wetter on average by the end of the century under strong warming, but with greater variability year to year. Exactly how much, and where, remains an active area of research, and the monsoon remains one of the hardest parts of the climate system to model.

How is global warming affecting Himalayan glaciers and rivers?

Global warming is melting many Himalayan glaciers faster than they are replenished, shrinking a vital store of frozen freshwater. The Hindu Kush Himalaya region, sometimes called the Third Pole, holds more ice than any area outside the Arctic and Antarctica, and it feeds the Indus, Ganga and Brahmaputra systems. Regional assessments suggest that glacier mass is declining in most areas, with the loss accelerating this century, although some parts of the Karakoram have shown a puzzling stability that scientists call the Karakoram anomaly.

In the short term, melting can increase river flow, but over the longer term glaciers shrink and the dry-season supply falls. Meanwhile, rising temperatures turn more precipitation into rain instead of snow, so the snowpack that stores winter water is thinner. Meltwater also forms new glacial lakes that can burst suddenly, as in the Kedarnath disaster of 2013, the Chamoli flood of 2021 and the South Lhonak lake outburst in Sikkim in 2023, although the causes of individual disasters are complex.

Because hundreds of millions of people downstream rely on these rivers for irrigation, drinking water and hydropower, the fate of the ice is one of the central questions for South Asia’s water security.

How does global warming threaten India’s coasts and seas?

Global warming threatens India’s coasts by raising the sea level, warming the surface water and fuelling stronger cyclones. Satellite and tide-gauge records indicate that sea level in the north Indian Ocean has been rising by a few millimetres each year, and the pace is expected to increase. India’s coastline of roughly 7,500 kilometres, home to megacities such as Mumbai, Chennai and Kolkata and to low-lying deltas like the Sundarbans, is densely populated and highly exposed.

Warmer seas can intensify cyclones, with the Arabian Sea in particular seeing an increase in the intensity of some storms in recent years, though the total number is not clearly rising. Warm water also bleaches coral in Lakshadweep and the Andaman and Nicobar Islands, and it acidifies as it absorbs carbon dioxide, which hurts shellfish and reef-dependent fisheries. Salt water creeping into rivers and aquifers spoils farmland and drinking water in delta regions.

How does global warming affect food, water and health in India?

Global warming affects food, water and health in India by stressing the crops, aquifers and bodies on which daily life depends. Wheat and rice yields are sensitive to high temperatures at key growth stages, and an early spike in heat in March, as in 2022, can shrivel grain before harvest. Studies suggest that without adaptation, yields of major cereals could fall under severe warming, while irregular rain also makes sowing decisions harder for the roughly half of India’s farmland that is rainfed.

Water is the other pressure point. Warmer air increases evaporation from soil, reservoirs and crops, so a given amount of rain goes less far. Groundwater, already over-pumped across Punjab, Haryana, Rajasthan and Gujarat, is the buffer farmers lean on during dry spells, and rising demand for irrigation in a hotter climate risks draining it faster. Health impacts include heatstroke, worsening air quality, shifts in the range of diseases such as dengue and malaria, and mental stress in farm households after crop failure.

These pressures fall hardest on the poor, women and people with little access to cooling, insurance or alternatives, which is why climate adaptation is as much about development as about weather.

What is India doing about global warming?

India is responding to global warming with a combination of emissions cuts, clean-energy growth and adaptation measures. In 2021 it announced a net-zero target for 2070 and a set of goals for 2030, which include building very large non-fossil electricity capacity, meeting half of its energy needs from renewable sources, and reducing the emissions intensity of its economy. Under its updated Paris Agreement pledge, India aims to cut emissions per unit of gross domestic product to well below 2005 levels by 2030, to raise the share of non-fossil sources in installed power capacity to about half, and to create an extra carbon sink through forest and tree cover.

Policy tools include the National Action Plan on Climate Change and its missions, state action plans, the push for solar parks and rooftop solar, the International Solar Alliance co-founded with France, electric mobility incentives, energy efficiency labelling, a developing carbon market and the Mission LiFE campaign for sustainable habits. On the adaptation side, the India Meteorological Department has been upgrading forecasting and cyclone warnings, which have sharply reduced loss of life in recent storms, and states are rolling out heat action plans and climate-smart farming.

India also stresses climate justice, arguing that developed nations should provide the finance and technology promised to developing countries, and that the burden should reflect historical responsibility.

Can global warming still be limited?

Global warming can still be limited, but only if greenhouse gas emissions fall steeply and soon, reaching net zero around mid-century for carbon dioxide. Every additional tonne of carbon dioxide adds to warming, which means that every fraction of a degree avoided reduces risks, and that the choice is not between disaster and safety but between worse and better outcomes.

The tools exist. Solar and wind are now among the cheapest sources of new electricity in India, batteries and electric vehicles are scaling up, and energy efficiency and methane reduction offer fast gains. Protecting and restoring forests, mangroves and wetlands stores carbon while also buffering floods and heat. The obstacles are mostly financial, political and logistical rather than technical, including how to retire coal fairly, how to finance clean energy for developing economies and how to protect workers and communities in transition.

What individuals and institutions do in this decade will matter disproportionately, because warming tracks cumulative emissions over time.

Bottom Line

Global warming is real, human-caused and already visible in India’s hotter summers, wilder rain and retreating ice. India has contributed less than most large economies to the problem historically and has much to lose from it, yet the choices it makes about energy, farming and cities will help shape the global outcome. Acting early on both emissions and adaptation is the surest way to protect the monsoon-dependent country that India is.

Frequently Asked Questions

Is global warming the same as climate change?

Not exactly. Global warming is the rise in the planet’s average temperature, while climate change includes all the resulting shifts in rainfall, storms, ice, sea level and seasons, and the two terms are often used together.

How much has India’s temperature risen?

Indian assessments put the rise in the country’s average temperature at roughly 0.7 degrees Celsius over the past century or so. The increase is uneven, and hot days, hot nights and heatwaves have grown more frequent.

Is global warming making the Indian monsoon stronger or weaker?

The picture is mixed. Seasonal totals vary naturally and have shown a slight decline in some decades, but heavy rain events are increasing and dry spells are lengthening, so the monsoon is becoming more erratic rather than steadily stronger or weaker.

Are Himalayan glaciers really melting because of global warming?

Yes, most Himalayan glaciers are losing mass as temperatures rise, although some Karakoram glaciers have behaved differently for local reasons. Continued melting is expected to reduce dry-season river flow over the long term.

What is India’s net-zero target?

India has pledged to reach net-zero greenhouse gas emissions by 2070. Alongside this, it has set 2030 goals on non-fossil power capacity, emissions intensity and forest-based carbon sinks.

What can individuals do about global warming?

Individuals can use energy efficiently, choose public or electric transport, cut food waste, adopt rooftop solar where possible and protect trees. Supporting clean-energy policies and community heat and flood preparedness also helps.

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