Nighthiker,
...because I believe this to be true, I agree and even considered posting basically the same thing as you said...only I don;t hink I could have worded it so well. Science is seeking answers to all unknowns and, in the interim, they're often venturing guesses and proclaiming them to be fact. Meanwhile, they keep working and the guesses keep coming and the facts keep "evolving".

Oldbaldguy,
We really don;t need witnesses to what happened LESS THAN a million years ago, science has at least learned enough to KNOW we had an ice age, and that it wasn;t the first. Exactly how it occurred and how it may occurr again is still baffling to them though, so you're right, it's a SWAG most of the time. BUT, algore knows the facts (just ask him or watch his proffered Oscar winner). He has just been unable, so far, to convince the real scientists that he has all the answers and they don;t. And sadly, in my opinion only, many millions of people believe him and others about this "man made" phenomenon.