Prehistoric Earth Was Very Hot. That Offers Clues About Future Earth.
Briefly

The Earth's climate history reveals a cycle of warming and cooling over 500 million years, influenced largely by carbon dioxide levels and sunlight.
Scientists warn that the significant amount of carbon dioxide humans are adding to the atmosphere could lead to more dramatic temperature increases than previously predicted.
According to climate research analyst Emily J. Judd, the new study offers a fresh view of the past climate that might reshape our future expectations.
The research highlights a crucial point: while immediate heating isn't expected, the long-term trend suggests a much warmer planet ahead.
Read at www.nytimes.com
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