"Although grimly expected in the light of global warming, we were surprised by how evident this difference really was."The industrial revolution, which amplified global mass use of fossil fuels, began at roughly the same time.According to a press release, the last time ice cores were researched from that region was in the 1990s, and at that time, they "did not indicate clear warming in central-north Greenland" — even as global temperatures were shown to be rising.Greenland's ice sheet is second in size only to that of Antarctica, with both bodies stories about 68% of the world's freshwater resources, according to Copernicus, the European Union's climate observation program.If Greenland were to completely melt, researchers believe it would raise global sea levels by about 24 feet."