Cancun climate change summit seeks new emissions deal

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Delegates from nearly two hundred countries are gathering in Cancun in Mexico this weekend for UN talks on climate change.

The conference is the latest in a series aimed at producing a legally binding treaty on global warming. But with the US and China reluctant to reduce carbon emissions, a new deal looks unlikely.

The Cancun meeting follows last year's Copenhagen summit, where world leaders again failed to agree a new treaty despite high hopes of an agreement.

David Shukman reports.

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