Global warming shrank animals in the past. Scientists say it could happen again

Global Shrinking
In this photo provided by Abigail D'Ambrosia Carroll, an Arenahippus jaw fragment (with second and third molars), as discovered in field. Global warming often leads to global shrinking for mammals, like us, a new study suggests. At least twice before in Earth’s history, when carbon dioxide levels soared and temperatures spiked, mammals shriveled in a bit in size, including our earliest primate ancestor, according to a new study based on fossil teeth found in Wyoming. And the study’s chief author said it could be a glimpse of a smaller mammal future under even faster man-made warning that’s going on now. (Abigail D'Ambrosia Carroll via AP)

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