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Fossil fuel. Any non-sustainable action that effs up Spaceship Earth really. http://www.ted.com/talks/lang/en/david_deutsch_on_our_place_...
Also, spacefaring. People saying humans should "spend the money down here", as if we were not already part of the universe, makes me nuts. http://en.wikipedia.org/wiki/Kardashev_scale And guns. People say "sometimes, war is the only way." I have a gut feeling that's just not true. If you have to resort to violence, even through intimidation, then you're not resolving a conflict, you're imposing a solution. I don't think this method has a long-term duration. http://www.ted.com/talks/peter_van_uhm_why_i_chose_a_gun.htm...