Here's a link to an animation from NASA of melting sea ice: http://www.nasa.gov/mov/391782main_sea_ice_concept.mov And also, a Science Journal Article on Arctic Ice: http://www.sciencemag.org/cgi/reprint/311/5768/1747.pdf GHG stands for Greenhouse Gases GIS stands for Greenland Ice Sheet LIG stands for Last Interglacial (130,000 years ago) Finally, here is a link to the current state of Arctic Sea Ice extent: http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/current.365.jpg Notice that while minimum sea ice extent was reached in September (as it usually does), the anomaly from the 1979 to 2000 mean has accelerated over the last few weeks and is now approximately 2 million square kilometers low. That's about 3 times the size of Texas. The sun set about a month ago, and yet the anomaly has actually grown since then. This illustrates to me that the cause is due to the inability of the atmosphere to dissipate heat due to greenhouse gas concentrations. Figure 2 of the Science article is also fairly interesting because it illustrates that current (0kyrs) solar anomalies do not support rapid melting of Arctic ice.