Global CO2 Levels Tick Past 400 Parts Per Million
Reversing concentrations of carbon dioxide in the atmosphere would take an unprecedented worldwide effort, say NOAA researchers.By Evan Thomas | May 7, 2015
Global atmospheric carbon dioxide levels just passed 400 parts per million for the first time.
The National Oceanic and Atmospheric Administration reports CO2 levels have been on track to pass this milestone for years. Some of its research sites recorded 400ppm as early as 2012. (Video via NOAA)
“This marks the fact that humans burning fossil fuels have caused global carbon dioxide concentrations to rise more than 120 parts per million since pre-industrial times. Half of that rise has occurred since 1980.”