Carbon dioxide levels hit landmark at 415 ppm, highest in human history

"We don't know a planet like this," Eric Holthaus, a meteorologist and writer at Grist, an online environmental magazine, posted on Twitter.

Carbon dioxide (CO2) concentrations have skyrocketed far higher than any levels in more than 800,000 years, according to data from the Scripps Institution of Oceanography at the University of California-San Diego, and levels have not been this high for millions of years, Holthaus said.

"This is the first time in human history our planet's atmosphere has had more than 415 ppm CO2," Holthaus tweeted. "Not just in recorded history, not just since the invention of agriculture 10,000 years ago. Since before modern humans existed millions of years ago."

Read more at USA TODAY

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