When money is involved you can bet the benefactors will support everyone in denial. Cigarettes and pollution were also denied until they weren't. Humans learn slowly if at all. Some still walk on the flat earth. Info below for the sane and responsible.
http://www.sourcewatch.org/index.php/Climate_change_skeptics/common_claims_and_rebuttal
"Merchants of Doubt: How a Handful of Scientists Obscured the Truth on Issues from Tobacco Smoke to Global Warming" by Naomi Oreskes, Erik M. M. Conway
http://www.amazon.com/dp/1608193942/ref=rdr_ext_sb_ti_sims_3
Is The Earth Past A Point of No Return? http://www.piercepioneer.com/earth-past-point-no-return/36957
Statistical analysis rules out natural-warming hypothesis with more than 99% certainty.
http://www.mcgill.ca/channels/news/global-warming-just-giant-natural-fluctuation-235236