Woods Hole Oceanographic Institution glaciologist Sara Das led and expedition to Greenland in 2006 and 2007. The object was to determine whether melting at the ice surface which is sensitive to climate change could influence how fast the ice can flow. If Greenland's 2-mile-thick ice sheet melts completely it would raise global sea level by 23 feet. It would add larger amounts of fresh water to the ocean which might affect ocean currents which can alter rainfall patterns, fisheries and climate
I blogged about Greenland lakes in 2006 here .