Carbon Dioxide in Our Air Hits an All-Time High

Global warming has reached a new milestone, but congratulations are neither in order nor welcome. April 2014 is the first month in human history where the average amount of carbon dioxide in the air topped 400 parts per million. This was announced by the Scripps Institution of Oceanography at UC San Diego, which monitors atmospheric levels of CO2 as part of the the Keeling Curve project. Last year, on May 9, 2013, the NOAO also announced that the CO2 levels had hit a daily average of 400 ppm f...