Music, thanks to Curiosity Stream for supporting PBS Digital Studios. Imagine an enormous rainforest teeming with life - trees, insects, pretty little birds, and primates climbing up in the canopy, while crocodiles and turtles swim in the rivers below. Beautiful, isn't it? Now, imagine this lush rainforest in the Arctic. There was a time not too long ago when the world warmed more than any human has ever seen. This ancient warming took place over the course of just two hundred thousand years, the blink of an eye in geologic time, and it ended much like it began - suddenly and mysteriously. It all started 56 million years ago at the very end of the Paleocene epoch. Back then, life was still recovering from the unpleasantness of the Cretaceous-Paleogene extinction event, which wiped out the non-avian dinosaurs. Things were already warm by today's standards, with no polar ice caps and higher sea levels. The continents, just beginning to take shape, were covered with habitats like temperate forests and deserts, along with a belt of rainforests around the equator. But this environment was about to change. In fewer than 20,000 years, the global average temperature increased by five to eight degrees Celsius, with the warming greatest at higher latitudes. At the poles, temperatures on land reached an average of 23 degrees Celsius, while the ocean waters got up to a balmy 20 degrees. This means you could have gone for a comfy swim in the seas around Antarctica. This remarkable and sudden warming event is known as the Paleocene-Eocene Thermal Maximum, or PETM, and it had a massive effect on life on Earth. When the PETM reached its peak, rainforests had expanded much farther than ever before. Fossils from North America, Europe, and Asia reveal habitats rich in plant life that are now associated with...
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