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They are murderers, tyrants, and madmen.”  Heartland even once marked Earth Day by mailing out 100,000 free copies of a book claiming that “climate science has been corrupted”  – despite acknowledging that “…all major scientific organizations of the world have taken the official position that humankind is causing global warming.” Heartland received more than 5,000 from Exxon Mobil from 1997-2006 .
Heartland also raked in millions from the Koch-funded organization Donors Trust through 2011. Koch and Americans for Prosperity/Citizens for a Sound Economy.
Many have received large donations from foundations established, and supported, by the fossil fuel billionaire Koch brothers.
The American Enterprise Institute (AEI) has routinely tried to undermine the credibility of climate science, despite at times affirming that the “weight of the evidence” justifies “prudent action” on climate change. The state of the global-warming debate, and politicking.
 Cato acknowledges that “Global warming is indeed real…” But when it comes to the causes of global warming, Cato has sent mixed messages over the years. human activity has been a contributor [to global warming] since 1975.”  Yet, on the same topic of whether human activity is responsible for global warming, Cato’s vice president has written: “We don’t know.”  Patrick Michaels, Director of Cato’s Center for the Study of Science, has referred to the latest Draft National Climate Assessment Report as “the stuff of fantasy.”  The most recent edition of Cato’s “Handbook for Policymakers” advises that Congress should “pass no legislation restricting emissions of carbon dioxide.”  Charles Koch co-founded Cato in 1977. These organizations play a key role in the fossil fuel industry's "disinformation playbook," a strategy designed to confuse the public about global warming and delay action on climate change. Because the fossil fuel industry wants to sell more coal, oil, and gas — even though the science clearly shows that the resulting carbon emissions threaten our planet. And what is the evidence linking them to the fossil fuel industry? Here's a quick primer on several prominent global warming skeptic organizations, including examples of their disinformation efforts and funding sources from the fossil fuel industry. CEI has also received funding from Koch foundations, dating back to the 1980s.  While claiming to stand up for “sound science,” the Heartland Institute has routinely spread misinformation about climate science, including deliberate attacks on climate scientists.