Table 2.7. Atmospheric Response to Fossil Fuel CO2 Input response to fossil fuel CO2 input from the mid 1950s to the mid 1970s. The percentage of fossil fuel CO2 remaining in the atmosphere varied over this period from 27% to 83% annually, with a mean value of around 56%. Some scientists believe that the percentage of man-made CO2 input remaining in the atmosphere will increase considerably in the next 50 to 100 years.$6 This will occur as a result of deforestation, which will reduce the biosphere reservoir, and of a small decrease in the ocean’s ability to take up atmospheric CO2 . Investigators feel that one of the major gaps in knowledge in the field of climate change is in the understanding of the carbon cycle. Current models of the carbon cycle may underestimate the amount of CO2 that
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