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It said CO2 concentrations will exceed 417 ppm at some point between April and June—50 percent higher than the 278 ppm present in the late 18th century when the industrial era kicked off.
It said CO2 concentrations will exceed 417 ppm at some point between April and June—50 percent higher than the 278 ppm present in the late 18th century when the industrial era kicked off.
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