Tag Archives: Global Warming

Carbon dioxide levels reach global milestone

Worldwide levels of carbon dioxide — the gas scientists say is most responsible for global warming — reached a significant milestone for the month of March, the National Oceanic and Atmospheric Administration said Wednesday.

The global monthly average for carbon dioxide hit 400.83 parts per million in March, the first time the average surpassed 400 ppm for an entire month since such measurements began in the late 1950s, NOAA said.

The last time carbon dioxide reached 400 ppm was millions of years ago, according to the journal Nature Geoscience. A 2009 report in the journal found evidence of CO2 levels of 365 ppm to 415 ppm roughly 4.5 million years ago.

Read full article in USA Today