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Page last updated at 08:00 GMT, Thursday, 10 December 2009

UN 'off by a substantial amount'

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The emission of harmful gases into the atmosphere has been under-estimated, according to one of the world's leading climate research institutions. Scientists at the Scripps Institution of Oceanography in southern California will make their case at the Copenhagen climate summit today. Professor Ray Weiss, a geochemist and an expert on trace gases, reflects on their findings.

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