Global Warming?

I really like Bill Maher's HBO show. I've watched his show since it was "Politically Incorrect" on the Comedy channel years ago. But Bill, like many in the media, often has guests on that agree with him and then doesn't ask them key questions. Friday night he had on a scientist who thinks that global warming is causing more and severe hurricanes (because the ocean is warmer). First of all, there are other scientists and meteorologists who believe that the wamer ocean is a cycle (the ocean was just as warm about 80 years ago and it resulted in a 10 year period of increased hurricanes). Personally, I believe that global warming is taking place, but it could very well have nothing to do with polution. The earth has gone through many dramatic changes, such as the ice age,and as far as we know, these changes were not man made.