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@feld @encthenet @bitcoaxer For almost anything but aviation/aerospace, batteries have an acceptable power density; combined with an electric drive train, they’re more efficient than ICEs, jet engines, fuel cells, etc. Their current incarnation certainly has its share of problems, but nowhere near the issues H2 gets you.
For aviation, we’ll see. I suspect synthetic hydrocarbons are more likely than H2 there; but batteries might get good enough too