Wyoming fossils reveal ancient forests collapsed during extreme global warming and took over 100,000 years to recover: A stark warning for today’s climate

Fossils from Wyoming are revealing how forests responded when Earth experienced one of its most intense episodes of global warming around 56 million years ago. A new study, published in the journal Science on August 13, 2026, reconstructs the structure of forests during the Paleocene-Eocene Thermal Maximum, or PETM, and finds that their canopies became dramatically more open as temperatures rose and moisture became less available.

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