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well at least they admit that using fuel cells in planes is a pipe dream. I much more reasonable option is to use H2 from carbon free sources (i.e. solar, wind, nuclear, etc.) combined with renewable carbon (atmospheric, biomass, algae, etc.) to make liquid fuels. typical jet fuel has an energy density (engergy/vol) 6x times of heavily compressed H2. It's hard enough to find space for my carry-on's on airplanes as it is, I don't need more space being taken up by huge fuel cell stacks and H2 tanks