Climate Change Impact Assessment in India: Regional Vulnerabilities and Future Scenarios

India is one of the countries most exposed to the consequences of a warming planet. With over 1.4 billion people, a 7,500 km coastline, the Himalayan glacier system in the north, and a massive agrarian workforce, the stakes are enormous. From shifting rainfall patterns in the Western Ghats to rising seas threatening Mumbai and Kolkata, climate change is not a distant threat for India – it is an unfolding reality. This post breaks down India’s greenhouse gas emission trajectory, projected changes in temperature and rainfall, coastal risks, water resource challenges, and the cascading effects on agriculture and public health.

India’s greenhouse gas emission profile 🔗

India is the world’s third largest emitter of greenhouse gases after China and the United States. However, the per capita picture tells a very different story. India emits roughly 3 gigatonnes of CO2 equivalent annually – about two to two-and-a-half tonnes per person, which is well below the global average. Five independent modelling studies have assessed India’s emissions trajectory through 2030, and most arrive at a similar conclusion: India’s per capita emissions are likely to stay under 4 tonnes of CO2 equivalent by 2030-31, compared to the 2005 global average of about 4.22 tonnes. Total national emissions are projected to remain below 6 billion tonnes.

Declining carbon and energy intensity 🔗

A consistent finding across all five studies is the continuous decline in both the energy intensity and carbon intensity of India’s GDP. India’s energy intensity has been falling at roughly 7.3% over a five-year period (2016-2021), outpacing the G20 average decrease of 6.3%. India’s NDC commitment under the Paris Agreement targets a 45% reduction in emissions intensity of GDP by 2030 relative to 2005 levels. Model estimates suggest India is on track to achieve this target with existing policies, though emissions may continue to grow in absolute terms beyond 2031 without additional mitigation measures.

When placed in global context, even a doubling of India’s 2012 emissions would put 2030 levels at less than half of China’s 2015 emissions. This underscores a key point: India’s emissions are significant in aggregate, but the per capita burden remains modest relative to developed economies. Trends such as falling electricity demand, cheaper renewables, and growing investor caution around coal suggest a lower-carbon future than many models anticipated.

Temperature and precipitation changes 🔗

India’s climate is already shifting. Temperatures across India have risen by approximately 0.7°C between 1901 and 2018. Projections from the Indian Network for Climate Change Assessment (INCCA) indicate that the annual mean surface air temperature is likely to rise by 1.7 to 2.0°C by the 2030s compared to the 1961-1990 baseline period. This warming will not be uniform – arid and semi-arid regions in the northwest are expected to warm faster than coastal areas.

Shifts in rainfall patterns 🔗

All regions of India are expected to see small increases in total annual precipitation. The Indian Himalayan Region may receive 5-13% more rainfall by the 2030s. However, total rainfall numbers can be misleading. India’s rainfall patterns have changed substantially over the past 30 years, with impacts on agriculture, forestry, and fisheries. The frequency of rainy days is projected to decline across most regions – meaning heavier rain on fewer days, increasing both drought risk during dry spells and flood risk during wet ones. The Himalayas are the exception, where rainy days may hold steady or increase slightly.

Recent climate model projections robustly indicate that monsoon rainfall anomalies in India will increase significantly during the 21st century due to global warming. This increased variability, rather than just the total quantity of rainfall, is what poses the greatest challenge for water management and agriculture.

Sea level rise and coastal impacts 🔗

India’s coastal regions are home to about 170 million of the country’s 1.4 billion people , making the country acutely vulnerable to rising seas. Tide gauge data shows that sea levels along India’s coast have been rising at approximately 1.3 mm per year, and this rate is expected to continue through the 2030s and beyond.

Cyclone intensity and storm surges 🔗

While the total number of cyclonic disturbances is projected to decrease by the 2030s, their intensity is a growing concern. Research published in Climate Dynamics found a 52% increase in the frequency of cyclonic storms over the Arabian Sea between 1982 and 2019, along with an 80% rise in their duration. The Indian Ocean is experiencing the world’s fastest rate of ocean surface warming, according to the IPCC’s Sixth Assessment Report. For India’s east coast, locations north of Visakhapatnam could experience 15-20% higher storm surge return periods for 100-year events.

Major cities like Mumbai, Kolkata, Chennai, Kochi, and Visakhapatnam are already experiencing frequent flooding and erosion from rising sea levels, leading to displacement and infrastructure damage. A recent study in Scientific Reports using machine learning models confirmed that Mumbai and Kolkata face the highest flood risks under high-emission scenarios.

India lost 235 square kilometres of land to coastal erosion between 1990 and 2016 , putting livelihoods and homes at risk. The Sundarbans – shared between India and Bangladesh – is particularly threatened, as the ecosystem directly or indirectly supports the livelihood of more than 1.3 million people with a population exceeding 4.4 million.

Water resources and extreme events 🔗

Climate change is redrawing India’s water map. Water yield projections vary dramatically by region. The Himalayan river basins may see increases of 5-50% in water yield, driven by accelerated glacial melting and increased precipitation. But this is a double-edged sword – short-term water abundance will give way to long-term scarcity as glaciers shrink irreversibly.

Declining water availability in the Western Ghats 🔗

Parts of the Western Ghats face the opposite problem: water yield could decline by up to 50%. Any adverse impact on water availability from glacial recession, decreased rainfall, and increased flooding would threaten food security, cause dieback of natural ecosystems, and adversely affect the coastal system. States like Karnataka, Kerala, and Maharashtra – all reliant on rivers originating in the Western Ghats – would bear the brunt.

Flooding and infrastructure risk 🔗

Flooding is projected to increase by 10-30% across most regions of India by the 2030s. This poses serious challenges for existing infrastructure – dams, bridges, roads, and drainage systems were designed for historical flood levels, not the amplified extremes that climate models now project. A 2018 study projects droughts to increase across northern and northwestern India in the near future, while towards the end of the century, most parts of the country will likely face more frequent and severe droughts. The coexistence of increased flooding and increased drought – sometimes in the same region during different seasons – makes adaptation planning exceptionally complex.

Agricultural productivity under threat 🔗

About 64% of India’s population remains dependent on agriculture for livelihoods , making the sector ground zero for climate impacts. The projections are stark.

Crop-specific impacts 🔗

Rice: Productivity is expected to decline by 4-20% depending on the region and the extent of warming. Without adaptation measures, rainfed rice yields are projected to fall by 20% by 2050 and 47% by 2080, while irrigated rice may see reductions of 3.5% by 2050 and 5% by 2080.

Wheat: Wheat production could decline by 4-5 million tonnes with as little as a 1°C rise in temperature. The rabi season crop is particularly sensitive to heat stress during the grain-filling stage.

Maize and sorghum: Yield reductions of 15-50% are projected. Climate models estimate kharif maize yields could fall by 18% by 2050 and 23% by 2080.

Coconut: Productivity declines of 10-30% are anticipated, particularly in coastal Kerala, Karnataka, and Tamil Nadu, where rising temperatures and erratic rainfall disrupt growing conditions.

Livestock and fisheries 🔗

Livestock productivity shows a mixed picture. Coastal and lowland regions may see decreased livestock output due to heat stress, which can reduce feed intake and milk yield in cattle. Conversely, the Himalayan region – traditionally too cold for optimal livestock rearing – could see modest productivity gains as temperatures warm. Fisheries face disruption as ocean warming alters fish breeding patterns and migration routes.

Health impacts: direct and indirect 🔗

Climate change affects human health through multiple pathways, and India’s dense population, stretched healthcare infrastructure, and tropical location make it especially vulnerable.

Direct health effects 🔗

Heat stress is the most immediate concern. In May 2022, a severe heatwave across India and Pakistan saw temperatures reaching 51°C, and climate change makes such extreme heat events 100 times more likely than they would be without warming. Without mitigation, these events – once expected roughly every 300 years – are now anticipated every three years. Outdoor workers, the urban poor, and the elderly are the most at risk.

Indirect health consequences 🔗

Vector-borne diseases: Warmer temperatures and altered rainfall expand the habitable range for mosquitoes carrying malaria and dengue. The distribution of disease-spreading insects is expected to shift as climate patterns change. Regions that were previously too cool or dry for these vectors may see new outbreaks.

Water-borne diseases: Sea level rise brings health risks including reduced availability of fresh water from saltwater intrusion, contamination of water supplies from submerged waste dumps, and increased incidence of waterborne illness. Flooding events, which are intensifying, flush contaminants into drinking water sources.

Malnutrition: With projected declines in staple crop yields, food security is directly at stake. For the more than 800 million Indians who live in rural areas and depend on climate-sensitive sectors, the prospect of declining crop yields, degraded lands, water shortages, and ill health is deeply alarming. Nutritional quality may also decline, as elevated CO2 levels can reduce protein and micronutrient content in grains.

Regional vulnerability snapshot 🔗

India’s climate risks are not evenly distributed. Different regions face distinct sets of challenges:

Indian Himalayan Region: More precipitation, glacial melting, increased flooding, but potential gains in livestock productivity and short-term water availability. Long-term glacier loss threatens the rivers that sustain hundreds of millions downstream.

Indo-Gangetic Plains: Extreme heat, wheat yield loss, groundwater depletion, and worsening air quality make this densely populated region highly vulnerable.

Western Ghats: Up to 50% decline in water yield, shifting forest types, and biodiversity loss. The narrow west coast strip is highly vulnerable to disasters from sea level rise, reduced sediment flow from dams upstream, and increasing cyclonic activities.

Eastern Coastline: Odisha, West Bengal, and Andhra Pradesh have been the most frequently affected by high-intensity cyclones. Storm surges, salinity intrusion, and displacement are ongoing concerns. The Sundarbans mangrove ecosystem serves as a critical buffer but is itself under threat.

Arid and semi-arid zones: Rajasthan, Gujarat, and parts of Maharashtra face increased drought frequency, desertification risk, and water stress that compound existing vulnerabilities.

The path forward 🔗

India’s climate challenge is defined by a central tension: the need for rapid economic development to lift hundreds of millions out of poverty, and the simultaneous need to build resilience against escalating climate risks. The declining carbon intensity of India’s GDP is a positive signal, but aggregate emissions continue to rise with economic growth. The country has committed to ambitious renewable energy targets and launched the National Action Plan on Climate Change with eight national missions covering solar energy, water, sustainable agriculture, and Himalayan ecosystem preservation.

But policy ambition alone is not enough. While India has surpassed its target of 50% non-fossil installed capacity well ahead of schedule and seen record investment in renewables with a 91.5% increase between 2023 and 2024, coal generation continues to account for about 75% of total electricity output. Bridging the gap between installed capacity and actual generation share remains a critical challenge. Adaptation strategies – from climate-resilient crop varieties to coastal infrastructure upgrades to early warning systems – need to scale up dramatically to match the pace of change already underway.

What do you think? Given that India’s per capita emissions remain well below the global average while it faces some of the world’s most severe climate impacts, how should the balance between development and climate adaptation be struck? And which of the regional vulnerabilities discussed here – Himalayan glacial loss, coastal flooding, or agricultural decline – do you think deserves the most urgent attention?

References

1. https://climateactiontracker.org/countries/india/
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC11450030/
3. https://www.sciencedirect.com/science/article/pii/S2667010022001007
4. https://apps.fas.usda.gov/newgainapi/api/Report/DownloadReportByFileName?fileName=Climate+Change+-+Agriculture+and+Policy+in+India_New+Delhi_India_05-25-2021.pdf
5. https://pmc.ncbi.nlm.nih.gov/articles/PMC2822161/
6. https://reliefweb.int/report/india/climate-change-displacement-and-managed-retreat-coastal-india
7. https://www.carbonbrief.org/the-carbon-brief-profile-india/