Gore optimistic that world will agree deal on climate change

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Al Gore, the former US vice-president, delivers an upbeat assessment of the global response to climate change today, saying he believes a "political tipping point" has been reached which will enable leaders to avert environmental catastrophe.

More bad news on climate change expected

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More bad news on climate change is expected as more than 2,000 climate scientists gather in Copenhagen. They will be trying to pull together the latest research on global warming ahead of political negotiations later in the year.