You realize that there is enoug carbon dioxide stored in the earth to turn it into an oven too, stored as fossil fules? That is thats whole worry.
And, second of all, there is no doubt among most reputable scientists that this in part natural. As much as the pro-global warming fan community doesnt want to beleive it, it is natural to a degree. How much? We can only speculate! You have heard the whole argument about the greenhouse effect, so i shall spare you of it. The point is, it is better to be overly cautious and turn out to be wrong than to be overly optomistic than be wrong, because once you royally screw up either way, theres no going back for several lifetimes. I dont know about you, but better safe the sorry, IMHO
Or perhas its better to say better to be safe and sorry than sorry and screwed! LMAO