Washoe County Library System

More than 200 million years ago, a cataclysm known as the Permian extinction destroyed nearly 97 percent of all living things. Its origins have long been a puzzle. Paleontologist Ward, fresh from helping prove that an asteroid had killed the dinosaurs, turned to the Permian problem, and he has come to a stunning conclusion: that the near-total devastation at the end of the Permian period was caused by rising levels of carbon dioxide leading to climate...