The last time carbon dioxide levels were this high, Greenland was mostly green, sea levels were up to 20 meters higher and trees grew on Antarctica. That was 2.6-5.3 million years ago.
Story highlights The last time carbon dioxide levels were this high, Greenland was mostly green, sea levels were up to 20 meters higher and trees grew on Antarctica, according to scientists who warned this week that there is more CO2 in our atmosphere today than in the past three million years.
Using a new computer simulation, researchers at the Potsdam Institute for Climate Impact Research , in Germany, found that the last time the earth's atmosphere had a CO2 concentration as high as today's was during the Pliocene epoch, the geological period 2.6-5.3 million years ago.CO2 emissions from human activities are the leading cause of climate change.
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