Tags : 400 ppm

Carbon Emissions Climate Global Warming News

CO2 Levels Reach and Maintain 400 PPM – A Dubious

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 […]Read More

Arctic Climate Climate Science Environmental News Environmental Resources Oceans

Study of Pliocene Arctic Yields Insights into Climate Change Today,

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 […]Read More