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Earth CO2 levels: Are we at the point of no return? Earth CO2 levels: The annual low for atmospheric concentrations of carbon dioxide has crossed the 400 parts per million threshold, a level not seen for millions of years.
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49 Species Added To Endangered List The federal government has determined that another 39 plants and 10 animals warrant protections under the Endangered Species Act. September 28, 2016 · By Nathan Eagle · The Beat · 1 · National Coffee Day Thursday.
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