According to data from the Mauna Loa Observatory in Hawaii, the concentration of CO2 in the atmosphere is over 415 parts per million (ppm), far higher than any point in the last 800,000 years. 

That’s the highest level since homo sapiens came onto the planet, meteorologist Eric Holthaus tweeted, and represents an increase of 15 ppm over just the past three years. 

CO2 levels in atmosphere higher than any point since evolution of humans | abc7chicago.com

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