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When this article says that “scientists don’t expect traditional silicon-based solar cells to become competitive with fossil fuels,” one has to ask, “Ever?” Can anyone accurately predict the future price of polysilicon or of fossil fuels?

Peter A. Kaczowka
Lenox, Mass.

Your article notes as a put-down that it would be necessary to build a 1-gigawatt nuclear-fission plant every day and a half for the next 45 years to meet anticipated global electrical demand.