From the Union of Concerned Scientists

CNN, Fox News, and MSNBC are the most widely watched cable news networks in the U.S. Their coverage of climate change is an influential source of information for the public and policy makers alike, but their accuracy varies significantly. All of them can take steps to improve their coverage of climate science: http://ucsusa.org/scienceorspin

The Union of Concerned Scientists -- formed after the development of the Atom Bomb and gained fame as the publisher of the Bulletin of Atomic Scientists --  is a distinguished scientific organization. One of my former colleagues is there. They are likely to be very good in judging the quality of information provided by the news networks.