Adriana Kocornik-Mina, Thomas McDermott, Guy Michaels, Ferdinand Rauch, 21 January 2016

During the past couple of months alone, floods have displaced 100,000 people or more in Kenya, in Paraguay and Uruguay, and in India, as well as more than 50,000 people in the UK. And rising sea levels due to climate change loom. This column assesses the risk and the challenges for policymakers. It details the effects of flooding in cities around the world, showing that economic activity is concentrated in low-elevation urban areas, despite their much greater exposure to flooding. And worryingly, economic activity tends to return to flood-prone low-lying areas rather than relocating.

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