I have long believed that at least some of the Hydrocarbons we have found (deep wells) cannot be easily explained by traditional theories. The Video below is just a low level primer. Real research is needed and has not been taken seriously by the mainstream. While I do NOT agree with all that Mr. Soon said I think this is a good introduction to the idea. This discussion is also a good conversation about the historical temperatures the world has seen.
Even if you believe that the temperature is overall warming, the question is it caused by humans or are there other forces at play? Lastly, is a rise in global temperatures a bad thing? Does a rise in CO2 doom us all? I personally do not think so.