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We Just Passed A Grim Carbon Dioxide Threshold, Possibly For Good

The world has hit a global warming milestone it may never recover from. Scientists at the Mauna Loa Observatory in Hawaii announced in 2013 that atmospheric concentrations of carbon dioxide reached a daily average above 400 parts per million for the first time in history. CO2 concentrations “haven’t been this high in millions of years,” said scientist Erika Podest at the time.
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