Lots of cars on a roundabout
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World leaders gather for climate change summit in New York

World leaders are being asked to make bold pledges to address climate change at a one day summit in New York.

UN Secretary General Ban Ki-moon said the global response to climate change will "define our future" and that a "clear vision is needed."

The summit aims to build momentum for a new world treaty on reducing greenhouse gas emissions next year.

David Shukman reports.

  • 24 Sep 2014
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