T. K. Tromp et al.'s Report "Potential environmental impact of a hydrogen economy on the stratosphere" (13 June, p. 1740) is a welcome addition to the analysis of potential future energy scenarios. However, several key assumptions made in the study represent unlikely extreme cases that are not well connected to current or likely future levels of hydrogen usage or system leakage. As a result, the baseline "scenario" presented in the paper is not a useful starting point for discussion and analysis.
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Kammen et al. (2003) studied this question.
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