The assumptions for the 2nd scenario are given here. The main difference being that a new energy source (fusion, solar, etc.) would be introduced in 2015 (first commercial unit) and that the penetration of that source into the energy market would follow an aggressive, but realistic rate. It is also assumed that the percentage of the energy market that the new energy source would capture is 50% in the year 2050 and that the % would remain constant until the end of the century. This will allow the coal resources to be stretched out to 2100 before they are essentially exhausted.
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