How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.
Read, read, read ...
http://www.google.com/search?q=steyer&oq=steyer&aqs=chrome..69i57.1252j0j7&sourceid=chrome&es_sm=119&ie=UTF-8
http://www.google.com/?gws_rd=ssl#q=greenpeace
http://www.google.com/?gws_rd=ssl#q=sierra+club
You may also want to research specific terms or organizations or people here:
http://scholar.google.com