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.) Carbon Cycle Atmospheric CO, at Mauna Loa Observatory 00Scripps Institution of Oceanography NOAA Earth System Research Laboratory 380 360 340 nona 320 1960 1970 1980 1990 2000 2010 2020 YEAR a.) Above is a graph of carbon dioxide (CO2) concentration in the atmosphere in parts per million (ppm volume) over time. Explain the variations of carbon dioxide over time. (6 points) b.) About 9 gigatons of C per year enter the atmosphere from the burning of fossil fuels, yet atmospheric concentrations only increase by about 4 gigatons of C does the excess atmospheric carbon dioxide go (4 points) per year)? Where
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