Scripps Institution of Oceanography. The Scripps Institution of Oceanography has been tracking the levels of CO2 using the Keeling Curve, created by Charles (Dave) David Keeling.
As of April 2022, the average monthly CO2 concentration in the atmosphere reached a staggering 420.23 parts per million (ppm).
That number is up from 315.00 ppm since the Keeling Curve’s genesis in 1958. But this is not the first time average global CO2 levels reached a record high.
In fact, in 2015, the average carbon dioxide measured by Scripps surpassed 400 ppm for the first time on record, according to Climate.gov. "It is likely May will be higher still," Pieter Tans, who tracks greenhouse gases for the National Oceanic and Atmospheric Administration, told Axios.The level of CO2 has been steadily increasing since the Industrial Revolution in 1750.