All true. I think of it as a spaceship. We can argue about how expensive maintenance of the food recyclers, water purifiers and oxygen systems are, but that's

All true. I think of it as a spaceship. We can argue about how expensive maintenance of the food recyclers, water purifiers and oxygen systems are, but that's really moot: we maintain those things or die. We'd have to make the decision to stop the oil industry etc. before it matters though. Until then the marginal cost of 1 spoon is vanishing small, and fussing over it is spending time and effort on foolishness.