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Latest News Wires Atmospheric carbon dioxide levels reach milestone

A monitoring station in Hawaii has measured carbon dioxide levels of 400 parts per million, a concentration not seen on Earth since the Pleistocene Era.

By Seth BorensteinAP Science Writer / May 10, 2013

Charlie Riedel/AP

Worldwide levels of the chief greenhouse gas that causes global warming have hit a milestone, reaching an amount never before encountered by humans, federal scientists said Friday.