US scientists have increased the pressure on George Bush and other world leaders to tackle climate change by signing a joint statement calling on G8 nations to reduce greenhouse gas emissions.
The statement, from the science academies of the G8 countries, says the scientific evidence on climate change is now clear enough to compel their leaders to take action.
It says: "There is now strong evidence that significant global warming is occurring. It is likely that most of the warming in recent decades can be attributed to human activities...
"The scientific understanding of climate change is now sufficiently clear to justify nations taking prompt action. It is vital that all nations identify cost-effective steps that they can take now, to contribute to substantial and long-term reduction in net global greenhouse gas emissions."
The statement has been issued ahead of the G8 summit in Gleneagles in July. It follows months of negotiations between the UK's Royal Society, which published it yesterday, and the other academies.
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