and one percent decrease of the fossil fuel emission each year from the 1990 value, and a scenario in which the emission remains constant at the 1990 value. Since we are applying a steady-state temperature model to a transient scenario, our results for temperature increase are somewhat higher than they should be for the larger fossil fuel use increases. For fossil fuel use changes that are small positive, zero, or negative, steady state and transient results are similar. It must be kept in mind, however, that all of our results are somewhat optimistic, since only the effect of CO2 emission is considered in this model. However, CO2 is not the only greenhouse gas that results from fossil fuel use. Thus, increases in fossil fuel use should be avoided, as they will result in several degrees of global warming by the year 2100, as seen in Figure 5. If fossil fuel use in the years after 2100 rises at one or two percent annually, then temperature will continue to rise. If fossil fuel use is held constant at 1990
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