Climate change: There is more CO2 in the atmosphere today than any point since the evolution of humans – CNN

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 at any point in the last 800,000 years, since before the evolution of homo sapiens.

Source: Climate change: There is more CO2 in the atmosphere today than any point since the evolution of humans – CNN