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No clue what you are talking about. I am talking about how to do anything at all with less units of energy and the more carbon neutral that energy is the better. As far a banning air travel or anything else you just never know.
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Just that it was a very specific 'anything at all'. I scrolled up the page and didn't find an antecedent. If you retro-fit your trailer start a build thread. If it's carbon neutral it will depend on the tow vehicle's motive power for regen.
As far as air travel — opportunity cost, unintended consequence, etc. Low and slow Zeppelins were the best.