The U.S. Geological Survey's Repeat Photography Project shows quite clearly the effects of global warming on glaciers in America.
Click the link below to view these photos.....
http://nrmsc.usgs.gov/files/norock/repeatphoto/Pairs/RepeatPhoto_pairs_Fullset_compr.pdf
Click the link below to view these photos.....
http://nrmsc.usgs.gov/files/norock/repeatphoto/Pairs/RepeatPhoto_pairs_Fullset_compr.pdf