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An amazing technology, optimizing the thing we need the least right now: rich people's private jets.

We need to fly as little as possible, not to incentivize it even more. 80% less fuel consumption? Expect people flying 5 times more, and feeling like they are doing a favor to the environment. Jevons Paradox.

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I don’t understand your comment…

If, indeed, this can be made to work with a zero emission hydrogen power source, why would we seek to limit that air travel the same way we might seek to limit fossil fuel based planes ?

Are you suggesting that air travel - of any kind - is negative?

Sure, once world emissions are zero, this could be zero emission. Before it obviously comes at the expense of something else.

Yes. The core concept of progressive views is 'pain and sacrifice'. It doesn't matter who but someone should always be making some personal sacrifices for the whole to be satisfied. Some times it is plastic straws by common people and some other times it is billionaires's hydrogen jets.

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