Page last updated at 12:22 GMT, Friday, 18 December 2009
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US President Barack Obama has called for world leaders to take action over climate, telling delegates at the Copenhagen summit ''the time for talk is over''.
He said all major economies must put forward action to reduce carbon emissions, and added there had to be a mechanism to review emissions on a global scale.
READ MORE: Uncertainty over Copenhagen deal
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Source: http://news.bbc.co.uk/2/hi/science/nature/8420675.stm
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