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co2 concentrations

CO2 Levels Reach and Maintain 400 PPM - A Dubious Milestone in Human History

June 3, 2014 by Tom Schueneman

Carbon Levels and Environmental Risk

The World Meteorological Organization has reported that, for perhaps the first time in human history, atmospheric concentrations of carbon dioxide (CO2) eclipsed 400 parts-per-million (ppm) in the northern hemisphere for the entire month of April.[read more]