Earth was once much, much hotter than it is today?

Question

Quizplus · Accepted Answer

Earth has gone through various fluctuations in temperature throughout its history, including periods of extreme heat. For example, during the early formation of Earth, it was constantly bombarded by asteroids and other debris, causing intense heat. Additionally, during the Paleocene-Eocene Thermal Maximum (PETM) period about 56 million years ago, global temperatures were estimated to be 5-8°C (9-14°F) higher than they are today.

Earth Was Once Much, Much Hotter Than It Is Today