In this August 16, 2019, photo, NYU student researchers sit on top of a rock overlooking the Helheim glacier in Greenland. Summer 2019 is hitting the island hard with record-shattering heat and extreme melt. Scientists estimate that by the end of the summer, about 440 billion tons of ice, maybe more, will have melted or calved off Greenland's giant ice sheet. Helheim glacier has shrunk about 6 miles (10 kilometers) since scientists visited in 2005. (Photo by Felipe Dana/AP Photo)
