[wildcats77]

http://www.medindia.net/news/Volcano-Deep-Down-Could-Be-Melting-Greenlands-Ice-30702-1.htm

Thinning of the crust (hot magma may the the real reason, but then again NASA doesn’t to USGS work.

[USAF70]

And to just add to the information already presented:

http://www.iceagenow.com/Ocean_Warming.htm