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According to the National Oceanic and Atmospheric Administration (NOAA), the outdoor annual mean growth rate of CO2 has steadily increased from 316 ppm (parts per
According to the National Oceanic and Atmospheric Administration (NOAA), the outdoor annual mean growth rate of CO2 has steadily increased from 316 ppm (parts per million) in 1958 to over _______ ppm in December 2019. Group of answer choices 408 514 722 643
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