HOW DID MAMMALS SURVIVE?

摘要

In a warmer world, will some areas really get too hot for humans to survive? One way to try to answer this question is to look at past warm periods, such as the Palaeocene-Eocene thermal maximum 56 million years ago. Before the PETM, Earth was already as much as 10℃ warmer than it is now. Then, over 20,000 years, the temperature shot up byafurther 5 to 9℃.