During the early Paleocene, about 66 to 56 million years ago, a species of small mammal known as Mixodectes pungens […] ...

They wouldn't have encountered a speck of ice; even before the events we're talking about, Earth was already much warmer than it is today. But as the Paleocene epoch gave way to the Eocene ...

Can’t? Allow us to refresh your memory: it was the Paleocene-Eocene Thermal Maximum, a 200,000-year period of rapid carbon release and global warming that turned Earth's oceans acidic and saw ...

The event is known as the Palaeocene-Eocene Thermal Maximum (PETM ... porpoises and dolphins would not exist if it weren’t for Earth resembling some form of enormous sauna.