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We broke a record this week — but not the good kind. On Thursday, scientists at a research facility on top of the Mauna Loa volcano in Hawaii reported that average daily levels of carbon dioxide in the atmosphere surpassed 400 parts per million for the first time. As the New York Times notes, CO2 levels haven’t been this high for at least 3 million years, meaning that we are likely to see changes to the climate never experienced by humans before. The 400 PPM milestone is symbolic, but it’s a reminder of how global efforts to curb greenhouse gas emissions are failing.