Carbon dioxide levels could reach their highest point in 50 million years by the end of the century:https://www.washingtonpost.com/news/energy-environment/wp/2017/04/05/carbon-dioxide-levels-could-reach-their-highest-point-in-50-million-years-by-the-end-of-the-century/?mc_cid=c99c9ace01&mc_eid=acd6b24698&utm_term=.64b64ff1d652 …
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