Looks to me like this is a natural occurrence not a man made GW crises because cars and very little industry were around before 1851 and it looks like the receding started long before that. They need to look to the sun for the ansewer


http://earthobservatory.nasa.gov/Featur ... nland3.php


Its reporting like this that gets everyone all shook up. GW supporting picture.


http://www.nasa.gov/vision/earth/lookin ... shavn.html