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   ocr: Opening sentence oft the secton nacates thati the focus WA be on d C02 from Fossil Fuels specitic cause. one of the greatest contributors to increased carbon dioxide in the atmosphere is the use of fossil fuels. Since the advent of the Industrial Revolution, about 154.4 gigatons (where one G ton equals one billion tons) of carbon have been added to the atmosphere. Of that amount, about 27 percent, or 45 G tons, was produced from 1970 to - 1978. Table 3. Carbon Released into the Atmosphere Year carbon added Ths entire 1950 1.63 paragraph explores now 1960 1970 2.16 3.96 fossi fuel usage increas ...