OK, this may be a little off topic but here is my synopsis on Global Warming. I agree it DOES occur and will occur again. HOWEVER, I believe that humans ARE NOT the cause of Global Warming.
Think of it this way. ~10,000 years ago there was an ice age (read the book A Short History of Planet Earth from a Melbourne University Professor). For that ice to melt there had to have been some sort of global warming right? 10,000 years ago humans may have been around, but they did not have industrial tools like we do today (ie, power plants, cars, engines, etc etc). THEREFORE, that proves the point that humans are NOT the cuase of Global Warming, however we are speeding up the process ever so slightly by pushing more and more carbon monoxide etc into the atmosphere!
Just some food for though