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 UN climate change report. Letters sent by the American Enterprise Institute, an ExxonMobil-funded think tank with close links to the Bush Administration, offered the payments for articles that emphasise the shortcomings of the report. Travel expenses and additional payments were also offered. The institute has received more than $1.6 million from ExxonMobil - which yesterday announced a $50 billion annual profit, the biggest ever by a US company - and more than 20 of its staff have worked as consultants to the Bush Administration. A former head of ExxonMobil, Lee Raymond, is the vice-chairman of the institute's board of trustees.