Ice cores recently taken from from Greenland have turned up an exciting find: DNA that may be nearly a million years old, the oldest ever found. Analysis of the samples showed that Greenland’s ecosystem used to look a lot like Canada’s boreal forests. But the cores have raised new questions, as well: they indicate that Greenland has been under ice for four times as long as had been believed. And if that’s the case, then water from Greenland’s ice sheet can’t have contributed to the last sea level rise. So the new mystery scientists have to solve is, if the water didn’t come from Greenland, where did it come from?
Source: Mason Inman, Oldest Known DNA Found in Greenland Ice Core. National Geographic, July 5, 2007.