Humans didn’t exist the last time there was this much CO2 in the air

Grist
By Eric HolthausMay 3, 2018, 4:05 pm93 pts
The last time atmospheric carbon dioxide levels were this high, millions of years ago, the planet was very different. For one, humans didn’t exist. On Wednesday, scientists at the University of California in San Diego confirmed that April’s monthly average atmospheric carbon dioxide concentration breached…

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