Portal to the past: Geologist identifies metamorphic rock as a crucial feature of the ancient Earth's carbon cycle
Nov 04, 2024
If Earth's history were a calendar year, humans would not appear until the last few minutes before midnight on Dec. 31. During the Proterozoic Eon—2.5 billion years to 543 million years ago—the sun was still a young star, much dimmer than today, and Earth required a stronger greenhouse effect to compensate and maintain habitable temperatures for the planet's earliest lifeforms.
https://phys.org/news/2024-11-portal-geologist-metamorphic-crucial-feature.html
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