Funny how all the armchair deniers in this thread write 10 word elaborations like this, ignoring all the evidence already posted by the ones in this thread (aside from the scientific community.
Just to not be like the deniers, I'll post a reference too. Here's one that refutes all the counter arguments commonly used by the carbon lobby and it's puppets like Fox.
The good thing is that it is readable even if you don't have any scientific training:
http://www.skepticalscience.com/argument.php