
The UK government's official climate change advisers have raised the bar on ambitions to cut emissions.
The Committee on Climate Change (CCC) said a cut in greenhouse gas emissions of at least 80% by 2050 should include international aviation and shipping.
It said other industries would have to make up any shortfall in those areas.
Prime Minister Gordon Brown has intimated at an 80% cut but ministers have been wary of counting aviation and shipping, where cuts are difficult.
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