Mankind has had less effect on global warming than previously supposed, a United Nations report on climate change will claim next year.

The UN Intergovernmental Panel on Climate Change says there can be little doubt that humans are responsible for warming the planet, but the organisation has reduced its overall estimate of this effect by 25 per cent.

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Sediments extracted from the Antarctic seafloor show the world's largest ice shelf has disintegrated and reappeared many times in the past.

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