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A City on Mars: Reality kills space settlement dreams
(arstechnica.com)
This is a most excellent place for technology news and articles.
I often find that technological pessimists are imagining some very specific flawed scenario and then arguing about how that scenario is terrible or impossible, rather than arguing about the technology in general. Often the best way to debate them is to start by getting them to clarify exactly what scenario they're thinking of, the limitations of their argument will usually become quite apparent just by doing that.