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CO2 levels on the rise - reach 400 ppm for April in Northern Hemisphere

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

The World Meteorological Organization reports that, for 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.CO2 concentration varies with the seasons, generally reaching their highest level early in the northern hemisphere’s spring before seasonal intake of CO2 from vegetation. The first recording of 400 ppm…

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Arctic Monitoring Stations Report CO2 Levels of 400 parts per million

The Arctic region continues to serve as the global climate “canary in a coal” mine. Now, as with average temperature rise, the region is leading into a new troubling milestone as monitoring stations near a remote outpost near Barrow, Alaska are among several such stations to report that average concentrations of CO2 have reached an average of 400 parts per…

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