Last week, The New York Times published an exclusive about how Greenland is melting away. They had satellite photos and drone footage of the massive river formed by the melting ice sheet. It could raise sea levels by 20 feet, and could turn the world into something seen in Steven Spielberg's A.I. Artificial Intelligence. In the film, global warming has flooded the coastlines and pretty much decimated humanity: For years, scientists have studied the impact of the planet's warming on the Greenland and Antarctic ice sheets. But while researchers have satellite images to track the icebergs that break off, and have...