Watch out: Mammals shrink when Earth heats up, study says

WASHINGTON — Global warming shrank certain animals in the ancient past, and scientists worry it could happen again.

Warm-blooded animals got smaller at least twice in Earth's history when carbon dioxide levels soared and temperatures spiked as part of a natural warming, a new study says.

University of New Hampshire researcher Abigail D'Ambrosia warned that mammals — but not people — could shrivel in the future under even faster man-made warming.

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