the nine regions were weighted by their population. Figure 3 shows the log normalized energy consumption per capita versus the log normalized GNP per capita. The data points lie close to the line, demonstrating a correlation between energy consumption per capita and GNP per capita. Carbon Cycle Modelling If the world is to satisfy its growing energy needs through fossil-fuel-generated energy, it is necessary to predict the resulting climate change (if any), in order to determine if non-fossil fuel alternatives should be developed, and, if so, to what extent they will have to be deployed. The way we have done this is by determining a limit on the allowable fossil fuel combustion (or emission) that will be permissible when the greenhouse constraint is imposed. A useful tool in this endeavor is a carbon cycle model. Such a model calculates the change in atmospheric CO2 concentration that results from the emission of CO2 into the atmosphere (e.g., from fossil fuel combustion). Wigley has devised an elegant carbon cycle model (henceforth referred to as the forward model) that he has inverted.8 The inverse
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