Disasters happen when a natural hazard such as a flood, storm, earthquake, drought or heatwave meets people and places that are exposed and unprepared. Countries reporting to the UN recorded an average of about 41,000 disaster deaths a year in 2015–2024 and 123 million people affected each year. Single events can be devastating: in 2025 the Myanmar earthquake killed at least 3,820 people, an earthquake in Afghanistan an estimated 2,200, and Tropical Cyclone Senyar left 1,109 people dead or missing on Sumatra in Indonesia, where it also left 3.2 million people in need of help. Beyond the deaths, disasters destroy homes, schools, clinics, roads and harvests. Reporting countries lose more than US$110 billion a year in direct economic losses, and UNDRR estimates that the full cost, once knock-on effects and damage to ecosystems are counted, exceeds US$2.3 trillion a year.
The burden is unequal. The least developed countries account for 28.7% of reported disaster deaths but only 12% of the population of reporting countries, and landlocked developing countries for 20.8% of deaths with 5.1% of the population. Poorer households tend to live in less safe housing and in more exposed places, have little or no insurance and fewer savings to recover, so one disaster can undo years of progress. The good news is that disaster deaths can be prevented: the reported death rate has fallen by nearly two thirds compared with the previous decade, a change the UN links to better early warning and preparedness. But the number of people affected has doubled over the same period, driven by growing cities, environmental degradation and climate change.
How disaster risk is measured
The Sendai Framework for Disaster Risk Reduction 2015–2030, adopted by UN member states in March 2015, sets seven global targets tracked with 38 indicators, several of which are also SDG indicators. Countries report their own losses to UNDRR through the Sendai Framework Monitor, while the independent EM-DAT database records major events worldwide. The main measures are:
Deaths and missing people
The number of people who died or went missing because of disasters, per 100,000 population (SDG 1.5.1, 11.5.1 and 13.1.1). Because one large event can dominate a single year, the UN compares ten-year averages; its latest figures exclude COVID-19 deaths.
People directly affected
People injured, made ill, evacuated, displaced or whose homes or livelihoods were damaged. The global rate rose from 1,199 per 100,000 people in 2005–2014 to 2,445 in 2015–2024.
Economic losses and damage to services
Direct economic losses (SDG 11.5.2) and damage to critical infrastructure and disruption of basic services such as health, education and water (SDG 11.5.3). Reporting countries recorded an average of 91,847 damaged or destroyed facilities and more than 1.5 million service disruptions a year.
Strategies and early warning
Whether countries and local governments have disaster risk reduction strategies in line with the Sendai Framework (SDG 1.5.3 and 1.5.4), and whether people are covered by multi-hazard early warning systems, the Sendai Framework's Target G. These measure preparation, not whether it works in practice.