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The G8 leaders are set this week to deliver their strongest statement so far on global warming.

They are likely to agree that the world ought to cut greenhouse gas emissions by 50% by 2050 – with rich nations reducing them by 80%. The group will probably also say that any human-induced temperature rise should be held to 2C – a level considered to be a danger threshold.

The US has previously objected to such a clause. But it looks as though the G8 will fall short of agreeing the short-term targets scientists say are essential to ensure that the 2C threshold is not breached.

Environmental campaigners accuse the G8 of willing the ends on climate change but not willing the means. American officials have privately told BBC News they cannot cut emissions as fast as the science requires, because the issue is still too politically contentious in the US Congress.

A group of 22 leading climate scientists has written to G8 and MEF leaders calling for policies that would see global emissions peak by 2020, and shrink by at least 50% by 2050.

“Unless the burden of poverty in developing nations is alleviated by significant financial support for mitigation, adaptation, and the reduction of deforestation, the ability of developing countries to pursue sustainable development is likely to diminish, to the economic and environmental detriment of all,” the scientists said.

Source; BBC News