landmark 415 ppm

  1. Clyde C Coger Jr

    Science and Technology : Carbon dioxide levels hit landmark at 415 ppm, highest in human history

    ... Climate Change is real :facepalm: Carbon dioxide levels hit landmark at 415 ppm, highest in human history https://www.usatoday.com/story/news/world/2019/05/13/climate-change-co-2-levels-hit-415-parts-per-million-human-first/1186417001/ Ryan W. Miller and Doyle Rice, USA TODAY
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