Atmospheric CO2 -- Update

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.