As climate change makes part of the world uninhabitable it will trigger mass migrations, according to experts.
The Intergovernmental Panel on Climate Change estimates that at least 207 million people will not have enough water within a decade, reports the New York Times.
Its correspondent saw first hand how one village in Bangladesh has seen many of its men leave as fishing became unsustainable and brackish waters destroyed rice fields.
Climate change, caused by the growing presence of carbon dioxide and other greenhouse gases in the atmosphere is also leading to sea level rises, which could see the full populations of islands such as the Maldives have to flee.
The UK has committed to cutting carbon dioxide emissions by 80 per cent before 2050.
Later this year leaders from around the world will meet in Copenhagen to try to find a way to combat climate change. They will be aiming to draw up a treaty to replace the Kyoto Protocol.
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