Leading Global Warming Skeptic changes mind after watching Al Gore Speak

[vernarial]

I don't really understand why so many people are skeptical of global warming or climate change. It's really very simple. Here are some facts.
1) Our climate is always changing. It just happens very slowly.
2)Global warming and cooling are always happening. The earth has gone through periods of warming and cooling throughout it's history.
3)Carbon dioxide is a "greenhouse" gas and humans are pumping tons of the stuff into the air daily.

I just don't understand whats so debatable. Maybe how much humans actually contibute to global warming. We certainly do contribute to the changing of our climate. It's a matter of how much impact we want to have. I personally would like to leave the world less polluted for my children and grandchildren. I don't want to leave a mess for them to clean up. I don't want to leave the next generations a fucked up world because I couldn't make a few simple changes to my personal lifestyle.