Published by: CBS News April 8, 2021
NOAA reported that the global average of atmospheric CO2 hit 412.5 parts per million (ppm) in 2020, a rise of 2.6 ppm from 2019, the fifth-largest increase since they began measuring atmospheric CO2 levels 63 years ago.
https://www.cbsnews.com/news/climate-change-carbon-dioxide-highest-level-million-years/