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"Under one of its mid-range estimates(*), the Intergovernmental Panel on Climate Change (IPCC) - the world's leading authority on climate change - has projected a global average temperature increase this century of 2 to 3 ºC. This would mean that the Earth will experience a larger climate change than it has experienced for at least 10,000 years." - http://www.royalsoc.ac.uk/page.asp?tip=1&id=6235
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