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DRAW IT (a) Estimate the average CO2 concentration in 1975 and in 2012 using the data provided in Figure 43.25. (b) On average, how rapidly did CO2 concentrations increase (ppm/yr) from 1975 to 2012? (c) Estimate the approximate CO2 concentration in 2100, assuming that the CO2 concentration continues to rise as fast as it did from 1975 to 2012. (d) Draw a graph of average CO2 concentration from 1975 to 2012 and then use a dashed line to extend the graph to the year 2100. (e) Identify the ecological factors and human decisions that might influence the actual rise in CO2 concentration. (f) Discuss how additional scientific data could help societies predict this value.
Figure 43.25 Increase in atmospheric carbon dioxide concentration at Mauna Loa, Hawaii, and average global temperatures.
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