I can tell you the only realy evidence of global warming is receding of glaciers.....but that has happened throughout earth's history ever since polar caps developed (there were no polar caps during dinosaur times, the atmospheric carbon was 50 times higher...and the earth life thrived more than it ever has since).

The point is...even if there is global warming....SO WHAT?
There is no evidence it does any harm.  Quite the contrary.

If you have your choice between global warming and global cooling...you want the warming trend.