When the Ice is Gone: What a Greenland Ice Core Reveals About Earth's Tumultuous History and Perilous Future

In 2018, lumps of frozen soil, collected from the bottom of the world's first deep ice core and lost for decades, reappeared in Denmark. When geologist Paul Bierman and his team first melted a piece of this unique material, they were shocked to find perfectly preserved leaves, twigs, and moss. That observation led them to a startling discovery: Greenland's ice sheet had melted naturally before, about 400,000 years ago.



In When the Ice Is Gone, Bierman traces the story of this extraordinary f...