Abstract
Flood exposure is increasing in coastal cities1,2 owing to growing populations and assets, the changing climate3, and subsidence4,5,6. Here we provide a quantification of present and future flood losses in the 136 largest coastal cities. Using a new database of urban protection and different assumptions on adaptation, we account for existing and future flood defences. Average global flood losses in 2005 are estimated to be approximately US$6 billion per year, increasing to US$52 billion by 2050 with projected socio-economic change alone. With climate change and subsidence, present protection will need to be upgraded to avoid unacceptable losses of US$1 trillion or more per year. Even if adaptation investments maintain constant flood probability, subsidence and sea-level rise will increase global flood losses to US$60–63 billion per year in 2050. To maintain present flood risk, adaptation will need to reduce flood probabilities below present values. In this case, the magnitude of losses when floods do occur would increase, often by more than 50%, making it critical to also prepare for larger disasters than we experience today. The analysis identifies the cities that seem most vulnerable to these trends, that is, where the largest increase in losses can be expected.
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References
Hanson, S. et al. A global ranking of port cities with high exposure to climate extremes. Climatic Change 104, 89–111 (2011).
De Sherbinin, A., Schiller, A. & Pulsipher, A. The vulnerability of global cities to climate hazards. Environ. Urban. 19, 39–64 (2007).
Nicholls, R. J. et al. in IPCC Climate Change 2007: Impacts, Adaptation and Vulnerability (eds Parry, M. L., Canziani, O. F., Palutikof, J. P., van der Linden, P. J. & Hanson, C. E.) 315–356 (Cambridge Univ. Press, 2007).
Nicholls, R. J. Coastal megacities and climate change. GeoJournal 37, 369–379 (1995).
Dixon, T. H. et al. Space geodesy: Subsidence and flooding in New Orleans. Nature 441, 587–588 (2006).
Climate Risks and Adaptation in Asian Coastal Megacities (The World Bank, 2010).
Hallegatte, S. et al. Assessing climate change impacts, sea level rise and storm surge risk in port cities: A case study on Copenhagen. Climatic Change 104, 113–137 (2011).
Link, L. E. The anatomy of a disaster, an overview of Hurricane Katrina and New Orleans. Ocean Eng. 37, 4–12 (2010).
Hallegatte, S. An Exploration of the Link between Development, Economic Growth, and Natural Risk Policy Research Working Paper No. 6216 (The World Bank, 2012).
Evans, E. et al. Proc. Inst. Civil Eng. 159, 53–61 (2006).
Kabat, P. et al. Dutch coasts in transition. Nature Geosci. 2, 450–452 (2009).
Kates, R. W., Colten, C. E., Laska, S. & Leatherman, S. P. Reconstruction of New Orleans after Hurricane Katrina: A research perspective. Proc. Natl Acad. Sci. USA 103, 14653–14660 (2006).
Ammerman, A. J. & McClennen, C. E. Saving Venice. Science 289, 1301–1302 (2000).
Nicholls, R., Brown, S., Hanson, S. & Hinkel, J. Economics of Coastal Zone Adaptation to Climate Change (The World Bank, 2010).
Peduzzi, P. et al. Global trends in tropical cyclone risk. Nature Clim. Change 2, 289–294 (2012).
The Changing Wealth of Nations: Measuring Sustainable Development in the New Millennium (The World Bank, 2010).
Vafeidis, A. T. et al. A new global coastal database for impact and vulnerability analysis to sea-level rise. J. Coast. Res. 917–924 (2008).
Chateau, J., Rebolledo, C. & Dellink, R. An Economic Projection to 2050: The OECD ‘ENV-Linkages’ Model Baseline No. 41 (OECD, 2011).
Acknowledgements
These are early results from an ongoing OECD research project. The authors acknowledge support from the OECD for this research and support from J. Chateau to provide the socio-economic scenario data from the OECD’s ENV-Linkages model. C.G. acknowledges support from the AVOID project. The views shared in this article represent those of the authors and are not intended to represent the views of the OECD or of its Member countries, or the view of World Bank, its executive directors, or the countries they represent.
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The four authors designed the study, interpreted results and authored the paper. S.H. developed and ran the models. R.N. and C.G. provided expert input on depth–damage curves and coastal protection.
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The authors declare no competing financial interests.
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Hallegatte, S., Green, C., Nicholls, R. et al. Future flood losses in major coastal cities. Nature Clim Change 3, 802–806 (2013). https://doi.org/10.1038/nclimate1979
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DOI: https://doi.org/10.1038/nclimate1979
