Glaciers are millions of years old. Agreed? At one time glaciers were ... liquid. So, at one point in history, our planet had much more water in liquid form than it currently does. That being the case, what caused the temperature to change and cool off the planet enough to make the glaciers? Further, what caused the last ice age to end (some scientists believe that there have been more than one) and warm up the planet enough that the land bridge in the Berring Straights is now under water? Why, off the coast of California, is the continental shelf lined with what appear to be river beds? Why, on mountain tops, are their sea fossils? If the glaciers of the past held enough of the water on our planet that the continental shelf was exposed, and the mountains where no oceanic life should be found hold fish fossils, and man didn't cause these extremes, why should we be so arrogant as to believe we hold that much sway over our environment?