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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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Study of the Arctic Pliocene will reveal clues to climate change today and into the future

Study of Pliocene Arctic Yields Insights into Climate Change Today, and for the Future

The mean monthly average concentration of carbon dioxide in the atmosphere as measured at NOAA’s Earth System Research Laboratory at Mauna Loa, Hawaii exceeded 400 parts per million (ppm) for the first time in modern history back in May. The last time atmospheric CO2 reached this level was during the Pliocene Epoch some 3 million to 5 million years ago,…

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