Earth's climate has varied from "summary" of A Short History of Nearly Everything: Special Illustrated Edition by Bill Bryson
The Earth's climate has been in a state of constant flux for billions of years. From the freezing depths of an ice age to the sweltering heat of a greenhouse world, our planet has experienced an astonishing range of temperatures and conditions. One of the most dramatic shifts in Earth's climate occurred around 50 million years ago during the Eocene epoch. This period was characterized by a much warmer climate than we experience today, with tropical forests growing as far north as the Arctic Circle. The oceans were also significantly warmer, allowing for the proliferation of coral reefs and marine life. However, the Earth's climate has not always been so balmy. Around 2.4 billion years ago, the planet experienced a series of intense ice ages known as "Snowball Earth." During these periods, the entire surface of the planet was covered in ice, with glaciers extending all the way to ...
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