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Page last updated at 09:07 GMT, Tuesday, 28 April 2009 10:07 UK

Finding global warming solutions

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One of the main themes of Barack Obama's first 100 days as US president has been his focus on tackling climate change - a distinct shift from the previous administration. Mike Hulme, of the University of East Anglia, discusses why experts still disagree about how the challenge of global warming should be met.

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