The earth is around 4 billion years old.
The icy continent of Antarctica wasn't always the barren landscape that we all know today. As early as 90 million years ago, the continent may have been covered in a temperate rainforest, similar to what you'd find in today's New Zealand, instead of an ice cap.
According to the researchers, CO2 levels may have been as high as 1680 parts per million (ppm), roughly four times higher than they are today.
Scientists find evidence of ancient tropical rainforest in Antarctica
Illustration of the Antarctic rainforest. Credit: Alfred-Wegener-Institut/James McKay. The icy continent of Antarctica wasn't always the barren landscape that we all know today. As early as 90 million years ago, the continent may have been
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