Climate Change Vulnerability: Understanding Risk Factors for People and Agriculture

Climate change does not affect everyone equally. Some communities, regions, and ecosystems bear a far heavier burden than others. The concept of climate change vulnerability helps us understand why certain populations and agricultural systems are more at risk – and what factors determine their ability to cope. From flooded coastlines in India to drought-stricken farmland in Sub-Saharan Africa, vulnerability shapes how climate change translates into real-world harm for people and their livelihoods.

What does vulnerability mean in the context of climate change?
Regional vulnerability patterns: who is most at risk?
Africa: the most vulnerable continent
South Asia and Latin America
Small islands at risk: a unique threat
India’s coastal vulnerability
States and territories at greatest risk
Climate change and development goals under threat
The link between climate and poverty today
Why vulnerability matters for climate action

What does vulnerability mean in the context of climate change?

In climate science, vulnerability refers to the degree to which a system – whether a community, ecosystem, or agricultural sector – is susceptible to and unable to cope with the adverse effects of climate change. The IPCC’s Third and Fourth Assessment Reports established an influential framework that defines vulnerability as a function of three interconnected factors: exposure, sensitivity, and adaptive capacity.

Exposure refers to the nature, magnitude, and rate of climatic variation a system experiences. This includes changes in temperature, rainfall patterns, frequency of extreme weather events, and sea-level rise. A coastal village regularly hit by cyclones, for instance, has high exposure.

Sensitivity is the degree to which a system is affected by climate-related stimuli. The effect may be direct – such as a decline in crop yields due to rising temperatures – or indirect, like increased coastal flooding caused by sea-level rise. A region heavily dependent on rain-fed agriculture is inherently more sensitive to shifting rainfall patterns than one with diversified irrigation systems.

Adaptive capacity is the ability of a system to adjust, moderate potential damages, or cope with the consequences of climate change. This is shaped by socio-economic factors like wealth, access to technology and information, governance quality, and institutional strength. A system with strong adaptive capacity can absorb shocks and recover; one without it is left exposed.

Put simply: a community is most vulnerable when it faces significant climate hazards (high exposure), is highly affected by those hazards (high sensitivity), and lacks the resources or institutions to respond effectively (low adaptive capacity).

Regional vulnerability patterns: who is most at risk?

Climate change impacts are global, but vulnerability is deeply unequal. Regions in the tropics and temperate zones – particularly South Asia, Sub-Saharan Africa, and parts of Latin America – face disproportionately severe consequences. These regions often combine high climatic exposure with limited economic resources and institutional capacity to adapt.

Africa: the most vulnerable continent

The IPCC has consistently identified Africa as one of the most climate-vulnerable continents. According to the African Development Bank, Africa remains the most vulnerable continent to climate change impacts under all warming scenarios above 1.5°C – despite having contributed the least to global greenhouse gas emissions.

Several structural factors drive this vulnerability. A large share of African economies depend on climate-sensitive sectors like agriculture, herding, and fishing. Agricultural productivity across the continent has already declined by 34% since 1961 due to climate change, a greater decline than any other region. Complex governance challenges, limited financial resources, and weak infrastructure further constrain Africa’s adaptive capacity.

The IPCC’s AR4 highlighted that in some African countries, yields from rain-fed agriculture could drop by up to 50% during dry years. More recent assessments confirm the picture: research published in PNAS found very high confidence that climate change will negatively affect at least parts of African agriculture, with projected yield impacts ranging from severe losses to modest gains depending on the crop, region, and scenario.

Seven of the ten countries most vulnerable to climate change globally are in Africa. The UN Economic Commission for Africa notes that 17 of the 20 most climate-threatened countries are on the continent, with climate change already affecting 2% to 9% of national budgets across African nations.

South Asia and Latin America

South Asia is another major hotspot. Recent data from the 2025 Global Multidimensional Poverty Index by UNDP shows that 99.1% of South Asia’s poor – roughly 380 million people – are exposed to one or more climate hazards such as extreme heat, floods, or drought. The region faces overlapping threats: rising temperatures reduce agricultural output, intensifying monsoons cause devastating floods, and glacial melt threatens long-term water security.

Latin American nations, similarly, confront a mix of extreme weather events, deforestation-related climate feedbacks, and economic dependence on agriculture. Communities in the Andes, Amazon basin, and Central American dry corridor are particularly exposed.

Small islands at risk: a unique threat

Small island developing states (SIDS) face a distinctive and existential set of climate risks. The IPCC has identified them as some of the most vulnerable regions to climate change since the very first assessment report in the 1990s, because large proportions of their populations, assets, and infrastructure sit in the coastal zone.

Sea-level rise is the most pressing threat. Even a modest 5-10 cm rise – projected for around 2030-2050 – could double the frequency of coastal flooding across much of the Indian Ocean and Tropical Pacific. For low-lying atoll nations like Kiribati, Tuvalu, and the Maldives, this is not an abstract future scenario. Land loss, saline intrusion into freshwater lenses, and erosion of habitable coastlines are already occurring.

Islands in the Pacific and Indian Oceans, along with those in the Caribbean, are vulnerable to a cascade of impacts. Sea-level rise worsens coastal flooding and erosion. Freshwater resources shrink as saltwater contaminates aquifers. Coral reefs – vital for fisheries, tourism, and coastal protection – are bleaching at unprecedented rates. The IPCC projects that above 1.5°C of warming, 70-90% of reef-building corals globally could be lost, with 99% disappearing at 2°C or more.

Tourism-dependent economies face a double hit: degraded natural attractions reduce visitor numbers, while the cost of repairing storm-damaged infrastructure strains already limited budgets. For many island communities, adaptation limits may be reached well before the end of this century, even under optimistic emission scenarios.

India’s coastal vulnerability

India, with a coastline stretching over 7,500 kilometres, faces severe and growing risks from sea-level rise. Sea levels along the Indian coast have risen by approximately 8.5 cm over the past 50 years, and the rate is accelerating. Scientific projections suggest that by 2100, 36 million Indians may be living in areas that experience chronic flooding.

Research indicates that a one-metre sea-level rise would displace approximately 7.1 million people and submerge around 5,764 square kilometres of land. A one-metre rise would also severely affect India’s low-elevation coastal zones (LECZs), which cover roughly 81,000 sq km and include major cities like Mumbai, Kolkata, and Chennai.

States and territories at greatest risk

Coastal states like Maharashtra, Goa, and Gujarat face significant threats from erosion, flooding, and saltwater intrusion. India lost 235 sq km of land to coastal erosion between 1990 and 2016, and roughly 33.6% of the Indian coastline is currently classified as vulnerable to erosion.

The Andaman and Nicobar Islands and the Lakshadweep archipelago are especially at risk due to their low elevation and limited land area. The Sundarbans in West Bengal – home to the world’s largest continuous mangrove forest and over 4.4 million residents – faces a particularly acute crisis. The average sea-level rise in the Sundarbans delta is about 8 mm per year, well above the global average of 3 mm. By 2050, an estimated one million people may need to relocate from the most vulnerable parts of the Indian Sundarbans.

Rising salinity is another major concern. As seawater intrudes into freshwater ecosystems and agricultural land, it damages crops and contaminates drinking water supplies. Fishing communities face habitat loss as breeding grounds shift, and coastal infrastructure – roads, ports, and power plants – is increasingly exposed to tidal and storm damage.

Climate change and development goals under threat

Climate change poses a serious obstacle to global development ambitions. The Millennium Development Goals – adopted by 189 UN member states in 2000 – aimed to halve extreme poverty, reduce child mortality, and improve health and education by 2015. While progress was made on several fronts, climate change has consistently undermined these gains, particularly in the world’s most vulnerable nations.

Studies have estimated that by 2100, an additional 145-220 million people in developing countries could fall below the $2-per-day poverty line as a direct result of climate change. Reduced agricultural productivity, water stress, increased disease burden, and displacement all contribute to pushing vulnerable populations deeper into poverty.

The impacts on child health are especially alarming. Projections have suggested up to 250,000 additional child deaths annually in developing nations due to climate-linked factors such as malnutrition, diarrheal diseases, and malaria. Children in the poorest communities – those with the least access to healthcare, clean water, and nutritious food – are the most affected.

The link between climate and poverty today

The relationship between climate hazards and poverty has only grown stronger. The 2025 Global Multidimensional Poverty Index found that nearly 8 in 10 of the world’s multidimensionally poor – 887 million people across 108 countries – are exposed to at least one major climate hazard. Of these, 309 million face three or four simultaneous hazards. Sub-Saharan Africa and South Asia bear the greatest burden, with 344 million and 380 million affected people respectively.

The takeaway is clear: climate change does not just threaten ecosystems and weather patterns. It actively deepens inequality, erodes livelihoods, and rolls back development progress – disproportionately harming those who have contributed the least to the problem.

Why vulnerability matters for climate action

Understanding vulnerability is not just an academic exercise. It is the foundation for effective climate adaptation. Without knowing who is most at risk, why they are at risk, and what resources they need, adaptation efforts will be misdirected and insufficient.

Effective responses require investment in adaptive capacity – building stronger institutions, expanding access to technology, improving early warning systems, and ensuring that the poorest communities have a voice in planning and decision-making. For agriculture, this means developing drought-resistant crops, diversifying livelihoods, and improving irrigation infrastructure. For coastal communities, it means managed retreat where necessary, nature-based protections like mangrove restoration, and infrastructure designed for a changing climate.

International climate finance also needs to be directed where vulnerability is highest. As the United Nations has emphasised, current adaptation funding remains grossly inadequate, with only a small fraction reaching the most vulnerable communities in developing countries.

What do you think? Should climate adaptation funding be allocated primarily based on vulnerability assessments rather than political considerations? And how can communities with the lowest adaptive capacity be better supported in building resilience before the worst impacts arrive?

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Table of Contents

What does vulnerability mean in the context of climate change? 🔗

Regional vulnerability patterns: who is most at risk? 🔗

Africa: the most vulnerable continent 🔗

South Asia and Latin America 🔗

Small islands at risk: a unique threat 🔗

India’s coastal vulnerability 🔗

States and territories at greatest risk 🔗

Climate change and development goals under threat 🔗

The link between climate and poverty today 🔗

Why vulnerability matters for climate action 🔗