There are no unbiased sources for anything. Try finding an unbiased source for the opposite claim, preferably one that has a better explanation for the data that we've been collecting the last few decades.
So far roughly one third of the CO2 in the atmosphere is man made. It's not the majority but hey we are trying our best to increase that number. Give us some time!
So there are no unbiased sources on why carbon dioxide is evil? You do understand that CO2-hate is like a religion, don't you?
And I have in fact gone to the IPCC's site and skimmed over a report. It was filled with phrases like "could reach ... by 2100" and "is projected to reach...". So no hard science, just empty speculation.
