Scientists and economists have been offered $10.000 each by a lobby group funded by one of the world's largest oil companies to undermine the major climate change report recently published. Letters sent by the American Enterprise Institute (AEI), an ExxonMobil-funded thinktank with close links to the Bush administration, offered the payments for articles that emphasise the shortcomings of a report from the UN√É's  Intergovernmental Panel on Climate Change (IPCC).