"In the centuries to come, history books will likely look back on September 2016 as a major milestone for the... https://t.co/0hMz6oDDON— Global Changemakers (@WeAreGCM) September 28, 2016
"In the centuries to come, history books will likely look back on September 2016 as a major milestone for the... https://t.co/0hMz6oDDON
*
350 ppm is a widely recognized upper limit number: see 350.org
Current number: co2.earth