Have you been to Glacier Park? I suggest you go there and take a tour. Especially look at the pictures of what the glaciers used to look like, and then look at the real glaciers now. Hard to argue against global warming then.
The pictures of what they used to look like are 50-100 years old, not 20,000. It's obvious from the rate of shrinking that they have not been shrinking at that pace since the last ice age.
