Hothouse Earths

Times when the Earth had no ice caps at all, and what kept them warm.

The working diagram The temperature chart with the hothouse spells shaded.

Page type: A lesson, led by a working diagram
Collection: Climate history, ice and heat
When: About 540 million years ago to 40 million years ago, in the Ediacaran, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous and Paleogene. The finished piece will give dates from its sources.
Status: Planned and outlined. Every fact in it will be checked against a named source and listed on Sources before it goes up.

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