One of the main reasons why governments decided two years ago to draw up a new global agreement on climate change was a major report published just before that year's UN climate summit in Bali. Its top-line conclusions produced a collective and decisive political move in favour of a global agreement bigger and bolder than anything seen before in the environmental field. This was the Fourth Assessment Report (AR4) from the Intergovernmental Panel on Climate Change (IPCC) - the disti
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