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may 17, 2018 - CO2 ppm reached 411.24 in May 2018; May 1998 it was 369.42
Added to timeline:
30 Dec 2019
0
0
707
2010s Environmental Timeline
Based on data by Jerome Glenn in his Year in Review
series. ...
Date:
may 17, 2018
Now
~ 5 years and 11 months ago