Presently, the Earth's average global temperature is about 59 degrees Fahrenheit, cooler than much of the Phanerozoic era.

Researchers from the University of Bristol in England, who collaborated on the project, created over 850 climate models that simulated weather conditions during the Phanerozoic period. Sign up for ...

While the “greenhouse” worlds of the Archean, Proterozoic, and much of the Phanerozoic may seem foreign in many ways, these times do reveal Earth’s full spectrum of known climate possibilities.