You can actually read peer reviewed science publications, or go see the Mendenhall Glacier with your own eyes. But, no one can really force you to believe anything, that's the great thing about belief. I suggest that folks who confuse belief with knowledge should look up the word epistemology. I've heard of some folks who don't even believe in gravity, others drive in front of trains (speaking of trains?) not believing in the force equals mass x acceleration formula, but the consequences can be pretty bad? Meanwhile, I'm going fishing, while the glaciers are still there to provide the water. But, I don't intend to drive back until at least two hours after the whiskey wears off, even if I "believe" I can?