Climate change models suggest temperatures will rise three and a half degrees over the next century, even if emissions cuts proposed by world leaders are made.
The increase may not sound like much but the implications for the world's population are bleak. Hundreds of millions of people are in danger of becoming "eco-refugees".
Tarek Bazley reports on a new computer game based on real scientific data that portrays the consequences of climate change on the "Fate of the World".
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