limate Change   The most abundant greenhouse gas is carbon dioxide. According to figures from the Intergovernmental Panel on Climate Change (IPCC), the amount of carbon dioxide in the atmosphere (in parts of volume per million) can be approximated by   C(t) ≈ 280e0.00127t parts per million   where t is time in years since 1750.   (a) Use the model to estimate the amount of carbon dioxide in the atmosphere in  1950, 1975, 2050, and 2075.   year 1950 1975 2050 2075 C(t) parts per million            (Round your answers to the nearest whole number.)   (b) According to the model, in what year, to the nearest decade, will the level surpass 430 parts per million? ______

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