Responses to "Questions about a Hydrogen Economy," by Matthew L. Wald, in the May issue reminded the editors of a well-known formula for magazine articles: Automobiles + Hydrogen Fuel / Future Speculation = (Letters x 10). Many writers took the magazine to task for not highlighting an alternative of choice, including biodiesel fuel, nuclear fusion and even ocean-wave energy generation. Skeptics of hydrogen argued that the article was too soft on the concept, whereas others were put off by the critical take. The science policy of the Bush administration, examined in "Bush-League Lysenkoism" [SA Perspectives], also drew large numbers on both sides of the equation. Calculate your own responses to the letters that follow.

This article was originally published with the title Letters.

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