29 May '15, 7am

The Last Time Carbon Dioxide Levels Were This High, Humans Hadn’t Evolved

The Last Time Carbon Dioxide Levels Were This High, Humans Hadn’t Evolved

This month carbon dioxide concentrations in the atmosphere surpassed 400 parts per million globally for the first time since the National Oceanic and Atmospheric Administration (NOAA) started tracking it. Concentrations are measured at 40 sites globally including two Arctic sites and a site in Hawaii. “It was only a matter of time that we would average 400 parts per million globally,” Pieter Tans of NOAA’s Global Greenhouse Gas Reference Network said in a news release, reported by IFL Science. “This marks the fact that humans burning fossil fuels have caused global carbon dioxide concentrations to rise more than 120 parts per million since pre-industrial times.” Half of that rise came about after 1980. The last time carbon dioxide levels were this high, humans had not even evolved yet, so we’re not quite sure what this means for the human race. But it’s no good. According ...

Full article: http://ecosalon.com/the-last-time-carbon-dioxide-levels-w...

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