Between 1853 and 1993, carbon dioxide ( CO2) concentration in the atmosphere rose from roughly 252 parts per million to 370 parts per million.  Assume that this growth can be modeled with an exponential function  Q=Q0(1+r)^t By experimenting with various values of the growth rate r, find an exponential function that fits the data for 1853 and 1993. Use this exponential model to predict when the CO2 concentration will double its 1853 level in ?

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