Climate adaptation is expanding, but the scale of exposure is expanding too. International public adaptation finance for developing countries reached US$28 billion in 2022, while modelled annual adaptation costs for those countries were estimated at US$215 billion during the current decade. At the same time, 3.6 billion people live in areas highly susceptible to climate change, and 4.5 billion people were exposed to climate-related hazards in 2024. These figures describe different measures and periods, but together they show why adaptation statistics matter: progress in planning and protection is being tested against large and uneven needs.
Contents
- Finance needs and flows
- National planning and implementation
- Early warnings and disaster resilience
- Cities and infrastructure
- Water, food and ecosystems
- Health, vulnerability and equity
Finance needs and flows
The central finance story is a large gap between money available and the cost of adaptation. The Adaptation Gap Report 2024 recorded international public adaptation finance to developing countries rising from US$22 billion in 2021 to US$28 billion in 2022. The same report estimated the annual adaptation-finance gap for developing countries at US$187–359 billion in 2024.
The scale changes depending on the measure used. Adaptation-finance needs identified in developing countries’ nationally determined contributions and national adaptation plans were estimated at US$387 billion per year through 2030. A separate modelling estimate put adaptation costs at US$215 billion per year during the 2020s, with a range of US$130–415 billion per year. The Adaptation Gap Report 2024: Come hell and high water projected that this modelled cost range could rise to US$280–500 billion per year by 2050.
| Finance or cost measure | Reported figure | Period or baseline |
|---|---|---|
| International public adaptation finance | US$28 billion | 2022 |
| Modelled annual adaptation costs | US$215 billion | 2020s estimate |
| Annual adaptation-finance gap | US$187–359 billion | 2024 estimate |
| NDC and NAP needs | US$387 billion per year | Through 2030 |
| Modelled cost range | US$280–500 billion per year | 2050 projection |
The Glasgow Climate Pact goal of doubling 2019 adaptation finance would close only about 5% of the estimated annual adaptation-finance gap, according to the 2024 assessment. That comparison is an assessment, not a claim that all finance and cost estimates share one method. The report’s figures use different definitions and should not be added together.
Technology-related support for adaptation also increased, from US$5.7 billion in 2018 to US$12.7 billion in 2022. In the same 2022 comparison, international public adaptation finance was about US$27.5 billion against modelled annual adaptation costs of US$215 billion. The difference illustrates why growth in flows does not by itself demonstrate that needs are being met.
National planning and implementation
National planning has become widespread. In 2024, 171 countries, or 87% of countries assessed, had at least one national adaptation planning instrument in place, according to the Adaptation Gap Report 2024. Among countries with an instrument, 51% had a second instrument and 20% had a third. Of the 26 countries without one, 16 were developing an instrument and 10 showed no indication of doing so.
Formal plans, however, are not the same as completed implementation. The National Adaptation Plans 2024 progress report counted 58 developing-country National Adaptation Plans submitted to the UNFCCC from the beginning of the NAP process through 4 October 2024. All 58 mentioned an institutional arrangement for adaptation. The Green Climate Fund had approved 86 adaptation or cross-cutting projects aligned with submitted NAP priorities across 50 of those 58 countries as of 23 September 2024.
Planning support was broader than the number of submitted plans. As of 23 September 2024, 102 developing countries, including 32 least developed countries, had approved Green Climate Fund readiness proposals for NAP formulation or related planning. Countries receiving that readiness support took an average of 45 months to submit a NAP. This elapsed time is reported as an average and does not describe every country’s process.
Access to adaptation resources also varied among least developed countries. By 31 July 2024, 13 least developed countries had accessed the full US$20 million Least Developed Countries Fund resource cap, while 16 had accessed none. These figures indicate a difference in access, not a complete measure of national adaptation spending or outcomes.
Early warnings and disaster resilience
Early warning systems are a practical measure of adaptation capacity because they connect monitoring and forecasting with action before a hazard becomes a disaster. The Global status of multi-hazard early warning systems 2024 reported that 108 countries had a multi-hazard early warning system at the end of March 2024, representing 55% of countries worldwide. Of those 108 countries, 69 assessed their systems as limited to moderate.
Coverage quality was associated with different reported disaster outcomes. During 2005–2023, countries with limited-to-moderate early-warning coverage recorded 3.79 disaster-related deaths per 100,000 people, compared with 0.63 per 100,000 in countries with substantial-to-comprehensive coverage. The corresponding figures for disaster-affected people were 3,087 per 100,000 and 881 per 100,000. These are reported comparisons across country groups, not a standalone estimate of the causal effect of early warning systems.
Important components remain less common. Only 38% of countries had multi-hazard monitoring and forecasting systems in 2024. Only 10% were compliant with the Global Basic Observations Network, and no least developed country was compliant. Just 33% of countries reported having plans for early action.
Anticipatory action nevertheless reached a large number of people. Between 2015 and 2022, 2.1 billion people were pre-emptively evacuated through anticipatory action, with 64% of them in Asia and the Pacific. Equity remains a concern: least developed countries represented 12.1% of reporting countries’ population but 26.6% of globally reported disaster mortality in 2023 data reported in 2024.
Cities and infrastructure
Urban adaptation is increasingly important because both population and exposure are concentrated in cities. The IPCC’s Summary for Policymakers used a 2020 baseline in which urban areas housed 4.2 billion people, more than half of the global population. A separate UN-Habitat review projected urban populations to reach 68% of the global population by 2050.
Coastal exposure adds another planning challenge. About 896 million people, nearly 11% of the global population, lived in the low-elevation coastal zone in 2020, according to the IPCC. That population is projected to exceed 1 billion by 2050. Overall, an additional 2.5 billion people are projected to live in urban areas by 2050, mainly in Africa and Asia, with up to 90% of projected urban population growth concentrated in those two regions.
Basic infrastructure access is uneven. In less developed countries, fewer than 60% of urban residents had access to piped water in the IPCC’s assessment. The same assessment found that at 3°C or higher warming, areas exposed to climate-related food-security hazards are projected to expand substantially compared with 2°C or lower warming. Its evidence base also reviewed transport plans across 40 cities in Portugal for adaptation, mitigation, well-being and equity considerations, showing how adaptation can be evaluated alongside wider urban goals.
Water, food and ecosystems
Water scarcity already affects a large population. Between 1.5 and 2.5 billion people currently live in areas exposed to water scarcity, according to IPCC Chapter 4: Water. Under a 2°C warming scenario, up to 3 billion people are projected to experience water scarcity by 2050; under 4°C warming, the figure is projected to reach up to 4 billion.
The IPCC Technical Summary gives a related range using present-day population: about 800 million to 3 billion people could experience water scarcity at 2°C warming, rising to about 4 billion at 4°C warming. These projections use different framing and should be read as scenario-based estimates rather than combined totals.
Adaptation choices can bring benefits, but they can also create risks. Roughly 25% of assessed water-related adaptation options had co-benefits, while 33% had reported current or future maladaptive outcomes. This distinction matters because an intervention that reduces one exposure can increase another if it shifts risk, excludes groups or depends on resources that do not remain available.
Food systems are a major national priority. A 2024 FAO analysis of available NDCs found that 94% of countries identified agrifood systems as a climate-adaptation priority. The analysis also found that 88% of countries’ national climate plans identified food insecurity and biodiversity loss among reported climate-related risks. Around 50% of countries reported climate-related impacts and risks for livestock, forest, ocean and coastal fisheries, or aquaculture systems in their NDCs.
Health, vulnerability and equity
Health impacts show why adaptation cannot be measured only through infrastructure or finance. The WHO climate change and health fact sheet reports that 3.6 billion people live in areas highly susceptible to climate change. It projects about 250,000 additional deaths per year between 2030 and 2050 from undernutrition, malaria, diarrhoea and heat stress alone. Direct health damage from climate change is estimated at US$2–4 billion per year by 2030, excluding agriculture and water-and-sanitation sectors.
Heat exposure is already reflected in mortality estimates. The WHO heat and health fact sheet reports that heat-related mortality among people aged over 65 increased by approximately 85% between 2000–2004 and 2017–2021. Studies estimate about 489,000 heat-related deaths per year globally during 2000–2019. Asia accounted for 45% of estimated global heat-related deaths and Europe for 36% in that period. An estimated 61,672 excess heat-related deaths occurred in Europe in summer 2022.
The World Bank’s Exposure, Vulnerability, and Adaptation to Climate Hazards data report that in 2024, 4.5 billion people were exposed to climate-related hazards and 2.8 billion lived in highly vulnerable conditions. An estimated 1.5 billion people were both exposed to hazards and living in highly vulnerable conditions. These categories overlap by design: the combined figure identifies people experiencing both conditions, not a sum of separate populations.
Social protection is one planned response. The World Bank Annual Report 2024 recorded a commitment to reach 500 million people with adaptive social protection by 2030, aiming for half of beneficiaries to be women. It is a target for future reach, not a count of people already served. Across all these measures, dates, geographies and definitions differ; the statistics are most useful when those limits stay visible.