Seeds, twigs, and insect parts found under two miles of ice confirm Greenland’s ice sheet melted in the recent past, the first direct evidence that the center — not just the edges — of the two-mile-deep ice melted away in the recent geological past. The new research indicates that the giant ice sheet is more fragile than scientists had realized until the last few years — and reveals increased risk of sea-level catastrophe in a warmer future.
