The Organisation for Economic Co-operation and Development (OECD) is just out with a new study, Future Flood Losses in Major Coastal Cities.
A press releases on the study reports:
The authors estimate present and future flood losses – or the global cost of flooding - in 136 of the world’s largest coastal cities, taking into account existing coastal protections. Average global flood losses in 2005, estimated at about US$6 billion per year, could increase to US$52 billion by 2050 with projected socio-economic change alone.
The cities ranked most 'at risk' today, as measured by annual average losses due to floods, span developed and developing countries: Guangzhou, Miami, New York, New Orleans, Mumbai, Nagoya, Tampa-St. Petersburg, Boston, Shenzen, Osaka-Kobe, and Vancouver. The countries at greatest risk from coastal city flooding include the United States and China. Due to their high wealth and low protection level, three American cities (Miami, New York City and New Orleans) are responsible for 31% of the losses across the 136 cities. Adding Guangzhou, the four top cities explain 43% of global losses as of 2005.