After the mission is complete, an inflatable motorboat retrieves the glider and returns it to the research boat. Holland's Greenland mission has determined that warm water under icebergs and most likely under glaciers is at the root of rising global sea levels (as opposed to warm air). He will next take his methods to Antarctica, whose ice sheets are 10 times the size of Greenland's.

Read the article from the April 2008 issue.