Three UK groups studying climate change have issued an unprecedented statement about the dangers of failing to cut emissions of greenhouse gases.
The Royal Society, Met Office, and Natural Environment Research Council say the science underpinning climate change is more alarming than ever.
They say the 2007 UK floods, 2003 heatwave in Europe and recent droughts were consistent with emerging patterns.
Their comments came ahead of crunch UN climate talks in Copenhagen next month.
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