Climate change announcements ahead of Copenhagen

The World
It's been a big week for the planet. Yesterday, the world's biggest polluter, China, said it would slow the rampant growth of its carbon emissions. This week President Obama voiced his own proposal: a committment to cut U.S. greenhouse gas emissions in several stages. BBC environment correspondent Matt McGrath joins us to make sense of these announcements - what do they mean for a hypothetical international climate change deal in Copenhagen?
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