While in college, I took classes in alternate energy--most involved solar energy. Let's face it, the most powerful energy provider for our planet is the SUN. And it seems that many among us want to ignore this point.
Global warming? Duh. The SUN is the most obvious culprit in this phenomenon. I live in a semi-arid area of the U.S. -- and it gets over 100 degrees F frequently in the summer. And I don't thing Joe Schmoe down the street with his big SUV did anything to cause this heat.
Since we're finding archeological remains of human habitation as the glaciers melt away, this sort of implies that there had been warmer days before "global cooling" (aka "ice age") happened. And humans were there for that. Humans evidently "adapted" to the new climate, and it seems that other animals, such as the wooley mammoth and the saber-tooth tiger weren't as quick at adapting to the new climate. Because we humans are still here and those critters aren't.
So, in my view, we're not experiencing "global warming"--well, yeah, we are. But it's probably more correctly referred to as "coming out of an ice-age". And when this "global warming" has run its cycle, we'll have to prepare for "global cooling" again. And, what are we going to blame this phenomenon on? Refrigerator salesmen? Yup. We humans may have to take the rap again.
Ah well... enough rambling.
While you are at it, check out the following resource on Solar Heat!