CO2 levels are the highest since humanity began
 

CO2 levels on Earth have officially hit 415 parts per million (ppm), according to readings taken at the Mauna Loa Observatory in Hawai'i. That's the highest level since homo sapiens came onto the planet, meteorologist Eric Holthaus tweeted, and repre...

https://www.engadget.com/2019/05/13/...human-history/