DeSmogBlog, which broke the story, said it had received the confidential documents from an "insider" at the Heartland Institute, which is based in Chicago. The blog monitors industry efforts to discredit climate science.
The scheme includes spending $100,000 on commissioning an alternative curriculum for schoolchildren that will cast doubt on global warming.
It was not possible to immediately verify the authenticity of the documents. "There is nothing I can tell you," Jim Lakely, Heartland's communications director, said in a telephone interview. "We are investigating what we have seen on the internet and we will have more to say in the morning." Lakely made no attempt to deny the veracity of information contained in the documents.
The Heartland Institute, founded in 1984, has built a reputation over the years for providing a forum for climate change sceptics. But it is especially known for hosting a series of lavish conferences of climate science doubters at expensive hotels at New York's Time Square as well as in Washington DC.
If authentic the documents provide an intriguing glimpse at the fundraising and political priorities of one of the most powerful and vocal groups working to discredit the established science on climate change and so block any chance of policies to reduce global warming pollution.
"It's a rare glimpse behind the wall of a key climate denial organisation," Kert Davies, director of research for Greenpeace, said in a telephone interview. "It's more than just a gotcha to have these documents. It shows there is a co-ordinated effort to have an alternative reality on the climate science in order to have an impact on the policy."
The Valentine's Day exposé of Heartland is reminscent to a certain extent of the hacking of emails from the University of East Anglia's Climate Research Unit in 2009. Those documents helped sink the UN's climate summit later that year. Read the full report here.
Source: Suzanne Goldenberg, US environment correspondent, The Guardian, guardian.co.uk.