Roughly half-a-century ago many Americans were faced with a startling revelation on scientific integrity: Testimony by industry-paid scientists repeatedly touted that there was no correlation between smoking tobacco and developing cancer. That made it official; scientists could be paid to lie.
Now, anthropogenic climate change threatens the health of the planet, but interests profiting from the status quo are fighting any efforts to meaningfully combat the problem. As with the tobacco industry’s apologist doctors, the climate change deniers have their own brand of cynically-mercenary, hired guns. Take as an example, Wei-Hock Soon. The New York Times will familiarize you with his case: http://www.nytimes.com/2015/02/22/us/ties-to-corporate-cash-for-climate-change-researcher-Wei-Hock-Soon.html?_r=0