Speakers at the 6th Annual Conference on Climate Change sponsored by the Heartland Institute.

The Heartland Institute, according to the Institute's web site, is a nonprofit "think tank" that questions the reality and import of climate change, second-hand smoke health hazards, and a host of other issues that might seem to require government regulation. A July 2011 Nature editorial points out the group's lack of credibility:

"Despite criticising climate scientists for being overconfident about their data, models and theories, the Heartland Institute proclaims a conspicuous confidence in single studies and grand interpretations....makes many bold assertions that are often questionable or misleading.... Many climate sceptics seem to review scientific data and studies not as scientists but as attorneys, magnifying doubts and treating incomplete explanations as falsehoods rather than signs of progress towards the truth. ... The Heartland Institute and its ilk are not trying to build a theory of anything. They have set the bar much lower, and are happy muddying the waters.