“Concentrations of the greenhouse gas carbon dioxide in the global atmosphere are surpassing 400 parts per million (ppm) for the first time in human history”—Scripps Institution of Oceanography

http://canadianenergyissues.com/2014/05/06/concentrations-of-the-greenhouse-gas-carbon-dioxide-in-the-global-atmosphere-are-surpassing-400-parts-per-million-ppm-for-the-first-time-in-human-history-scripps-institutio/