Disaster losses are increasing and evidence is mounting that climate change is driving up the probability of extreme natural shocks1–3. Yet it has also proved politically expedient to invoke climate change as an exogenous force that supposedly places disasters beyond the influence of local and national authorities4,5. However, locally determined patterns of urbanization and spatial development are key factors to the exposure and vulnerability of people to climatic shocks6. Using high-resolution annual data, this study shows that, since 1985, human settlements around the world—from villages to megacities—have expanded continuously and rapidly into present-day flood zones. In many regions, growth in the most hazardous flood zones is outpacing growth in non-exposed zones by a large margin, particularly in East Asia, where high-hazard settlements have expanded 60% faster than flood-safe settlements. These results provide systematic evidence of a divergence in the exposure of countries to flood hazards. Instead of adapting their exposure, many countries continue to actively amplify their exposure to increasingly frequent climatic shocks. Analysis of high-resolution annual data shows that global human settlements have expanded continuously and rapidly into flood zones, with those in the most hazardous zones increasing by 122% from 1985 to 2015.
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Fig. 4: Flood-safe versus flood-exposed growth: relative difference between settlement growth in safe and high-hazard areas from 1985 to 2015.. We use proprietary global fluvial and pluvial flood-hazard data with the permission of Fathom Global, who provide the data for academic purposes and can be contacted atGoogle ScholarVol. 4 2063–2117 .
This study has benefited from feedback and input by L. Bernard, R. Damania, V. Deparday, K. Garrett, C. Gevaert, N. Holm-Nielsen, B. Jongman, N. Lozano Gracia, S. Ramesh, C. Riom and L. Southwood. It was supported by the Global Facility for Disaster Reduction and Recovery .
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