These are
from the CO2.earth site. I'm sure one can find almost any number one wants, if one looks hard enough.
- March, 2016: 404.83 (up 0.6% since beginning of the year)
- February, 2016: 404.16
- January, 2016: 402.52 (no change year-over-year)
- January, 2015: 402.53
- January, 2014: 399.96
- January, 2013: 397.81
I needed to consolidate these/update this data for another post. This data is being posted for no other reason.
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