Originally Posted by
jungle
Interesting, the thing those photos don't tell us is that all glaciers have been receding for about ten thousand years. This can be inconvenient.
And good that they have!
During the Ice Age of the late Cenozoic era, a continental ice sheet, centered west of Hudson Bay (the floor of which is slowly rebounding after being depressed by the great weight of the ice), covered most of N North America; glaciers descended the slopes of the Rocky Mts. and those of the Pacific Margin.
Good skiing,poor lift service.But,as you say, cycles repeat,and there are a lot of factors to factor...
Glacial-Interglacial cycles seem to be controlled by orbital parameters of the Earth (the Milankovtich Cycle).
source:
http://www.geol.umd.edu/~tholtz/G102/102ceno3.htm