alt Hacker NewsFor transport you're right. I think the parent your referring to was specifically saying there's no alternative way to power a plane. That's my assumption at least.
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RankingMember • yesterday at 2:23 PM
I'd like to see an attempt at modern air cruises on giant zeppelins.
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I was saying a bit of both. megablast is correct that there are alternatives, but I'd maybe quibble with "viable". For example you can get from Stockholm to Umeå with a 1 hour flight or a 6-8 hour train journey, is the train a viable alternative? For aviation there aren't alternative fuels and on many journeys even the alternative transport options aren't in the same ballpark.