"Weapons of Mass Destruction" and "Climate Change"

I was once a believer that the world is warming and humanity is doomed if we don't stop our greenhouse gas emmisions. Then I began studying climate change professionally, and found that, even if the earth's temperature rose a couple degrees over the past hundred years, that is insignificant compared to changes of ten or twenty degrees in a few decades, which have happened naturally during the earth's long history. A couple degrees change over a hundred years time is extremely stable, and there is no reason to call it a "crisis" which is definitely "man-made," without real proof, enough to convince someone skeptical.
Like I said, I think it's a good thing to reduce pollution sometimes, just like it's a good thing to remove a dictator sometimes. It's the reason "why" that bothers me. Obama has a lot of good characteristics, and he'll probably end up to be an okay president, with some inevitable disappointment, but I feel the "Man-Made Climate Change" threat will be remembered in a similar way to Saddam's supposed "Weapons of Mass Destruction."