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Earth May Have Passed the Carbon Threshold — Permanently: What It Means for Business

Carbon dioxide in the earth’s atmosphere surpassed the 400 parts per million (PPM) mark last year. And research suggests these elevated levels may be permanent -- which should be a wake-up call to business for several reasons.
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Carbon dioxide at NOAA's Mauna Loa Observatory reaches new milestone: Tops 400 parts per million

Academics / General Science : ScienceDaily: Science Society

On May 9, the daily mean concentration of carbon dioxide in the atmosphere of Mauna Loa, Hawaii, surpassed 400 parts per million (ppm) for the first time since measurements began in 1958. Independent measurements made by both NOAA a...

Atmospheric CO2 levels last month averaged what a year ago was unprecedented in human history

US Politics / Liberal : Daily Kos

Almost exactly a year ago, the level of atmospheric carbon dioxide passed 400 parts per million (ppm) for the first time in human history. In fact, the global atmosphere hadn't seen such a concentration of the greenhouse gas in 3 mi...

World's Atmospheric Carbon Dioxide Passes 400 PPM Threshold. Permanently

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Carbon dioxide just hit its annual minimum at Mauna Loa Observatory and failed to dip below 400 ppm.

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It's all but official now: 400 ppm is the new normal. “Is it possible that October 2016 will yield a lower monthly value than September and dip below 400 ppm? Almost impossible,” Ralph Keeling, the scientist who runs the Scripps Ins...

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