where n(t) = temperature increase rate during year t in °C per year s = climate sensitivity in °C C(t) = CO2 concentration at the midpoint of year t C(t-l) = CO2 concentration at the midpoint of year t-1. Figure 4. Allowable annual fossil fuel energy production calculated for the three global warming scenarios indicated in the graph. Prior to 1990, energy production is inferred from observed atmospheric CO2 concentration. Equation 5 is a result of applying Equation 4 to a single year and then solving for n; thus, the right side of Equation 5 can be thought of as being divided by one year. The units of both sides of Equation 5 are therefore consistent. The temperature difference from 1990 for year t, called AT(t), is given by: The value of AT(t) has been initialized at 0 for the year 1990. Figure 5 shows AT(t) for 1990-2100 for five fossil fuel use (and thus emission) scenarios. These scenarios include a two percent and one percent increase as well as a two percent
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