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briandmyers · 3344 days ago · link · · parent · post: NASA Confirms Evidence That Liquid Water Flows on Today’s Mars
It's always going to cost a lot of energy to pull mass out of our gravity-well. Trying to discourage space travel on environmental grounds seems wildly misguided to me - you get much bigger bang-for-buck tackling things like airline and automobile travel. It will be a LONG time before rocket-damage to the environment comes anywhere close to just those two.