At the Copenhagen climate summit tomorrow, world leaders will attempt to do what has never been done before: stop the growth of manmade emissions of carbon dioxide.
The Rio meeting in 1992 that began the UN's climate change process did not do it. Nor did the Kyoto meeting in 1997 that agreed the first limits on greenhouse gases, accepted by all developed countries except the US.
As Ed Miliband, the UK climate secretary, put it, a limit to carbon dioxide emissions is the “big prize” to be won at Copenhagen.
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