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Hard to say if Greenland was green back then or not. Remember around that time you had explorers making maps of Antarctica's coast line. IF it was not exposed how did they do it? I thin back in the 600-1,000 AD that Greenland may have indeed been a green land. Then the Vikings went and found New Found Land.
Satellite photos reveal gigantic outburst floods. Researchers have studied satellite photographs of Lake Catalina, an ice-dammed lake in East Greenland -- and were truly amazed: Unnoticed by science as well as people living in the area, the lake has been the source of four major outburst floods over the last 50 years -- each representing an astounding mass of energy, equaling up to 240 Hiroshima-bombs, report investigators. Source 6d.
And that is why nature is so amazing and we are quite a bit less powerful than we give ourselves credit for. Think of the power they are talking about here.
Melting ice makes the sea around Greenland less saline. For the first time, ocean data from Northeast Greenland reveals the long-term impact of the melting of the Greenland ice sheet. The observed increase in freshwater content will affect the conditions in all Greenland fjords and may ultimately affect the global ocean currents that keep Europe warm. Source 1c.
Greenland becoming darker, warmer as its snow ages and changes shape. A reduction in the amount of fresh, light-colored snow in parts of Greenland is exposing older, darker snow. The research reports on new weather patterns and explains how the changing shape of snowflakes on the surface is leading to conditions on Greenland's ice sheet, including possibly increased melting. Source 3x.