The concentration of CO2 in the atmosphere has risen to over 415 parts per million -- far higher than at any point in the last 800,000 years, since before the evolution of humans

The concentration of CO2 in the atmosphere has risen to over 415 parts per million -- far higher than at any point in the last 800,000 years, since before the evolution of humans https://t.co/6qpnUNXfeS

— CNN (@CNN) May 19, 2019