The politicians, such as Al Gore, promote climate change as a tool of tyranny. They do not have credible science. They pay "scientists" and universities to produce certain outcomes and magically, they get what they are paying for. There is a lot of federal funding at stake to support a certain political position. Just ask Penn State. Typically, it would be called a conflict of interest.

Here are a couple fun examples:
Quoting from this article: http://thenewamerican.com/tech/environment/item/17207-al-gore-forecasted-ice-free-arctic-by-2013-ice-cover-expands-50
Gore publicly and very hysterically warned that the North Pole would be “ice-free” by around 2013 because of alleged “man-made global warming.” Citing “climate” experts, the government-funded BBC hyped the mass hysteria, running a now-embarrassing article under the headline: “Arctic summers ice-free ‘by 2013’.” Other establishment media outlets did the same.
Well, 2013 is almost over, and contrary to the alarmist “predictions” by Gore and what critics refer to as his “doomsday cult,” the latest satellite data show that Arctic ice cover has actually expanded 50 percent over 2012 levels.

check out these climate change/global warming idiots:
http://thenewamerican.com/tech/environment/item/17277-global-warming-alarmists-stuck-in-antarctic-sea-ice

Look into the origins of Earth Day. It was a group of communists used to gain power and take away liberty.

Any climate change discussion should keep this in mind.