The amount of carbon dioxide in the atmosphere has been increasing over the past century as a result of the combustion of fossil fuels (coal, oil, and natural gas). Carbon dioxide is a green- house gas that plays a significant role in climate. The increase in carbon dioxide is correlated with changes in climate that have climate scientists concerned. The graph shown here illustrates the increase in atmospheric carbon dioxide from 1860 to the present. Study the graph and answer the questions that follow. 410 400 390 380 370+ 360+ 350 - 340 + 330+ 320+ 310+ 300 290 1860 1880 1900 1920 1940 1960 1980 2000 2020 Year A Atmospheric carbon dioxide concentration from 1850 to present. What is the percent increase in the level of carbon dioxide between 1880 and the present day? Carbon dioxide concentration (parts per million by volume)

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