US memos expose climate 'dirty tricks'
Washington - Leaked documents from a prominent US conservative think tank show how it sought to teach schoolchildren scepticism about global warming and planned other behind-the-scenes tactics using millions of dollars in donations from big corporate names.
The documents show that more than $14m of the money used by the Chicago-based Heartland Institute would come from one anonymous man.
Heartland is one of the loudest voices denying man-made global warming, hosting the largest international scientific conference of sceptics on climate change.
Several of its documents were leaked this week to the news media, showing the planning and money behind its efforts.
Heartland said some of the documents weren't accurate, but declined to be more specific.