What the Pliocene epoch can teach us about future warming on Earth
About 3 million years ago, carbon dioxide levels were similar to today’s. What other changes might we expect?

BLAST FROM THE PAST Three million years ago, Earth’s climate was so warm that the High Arctic supported forests (illustrated) in which camels and other animals roamed.
Julius T. Csotonyi
This article is only available to Science News subscribers.
Subscribers, enter your e-mail address to access our archives.
