Re: Flight on na-Barsoom
IIRC, there was an "atmosphere plant" on Burrough's Barsoom. It was a huge facility that could have been regulating greenhouse gases. One of my favorite little games when I was reading them was to regard Carter as an unreliable narrator, then find out what was really going on.
Magnus lift spheres could work for airships, too. You could mount the spheres at the corners of an airship, it seems to me (however many corners an airship may have).
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