Next to water vapor, the most abundant greenhouse gas is carbon dioxide. According to figures from the Intergovernmental Panel on Climate Change (IPCC) and the National Oceanic and Atmospheric Administration (NOAA), the amount of carbon dioxide in the atmosphere (in parts of volume per million) can be approximated by C(t) = 280e0.00146t 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 1975, 2000, 2050, and 2100. (Round your answers to the nearest whole number.) year 1975 2000 2050 2100 C(t) parts per million According to the model, during which year, to the nearest decade, will the level surpass 420 parts per million?

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