It is cheap now, but think of it more as a loan. The price of being so wasteful will come for future generations who will have to deal with all our rubbish and all sort of environmental issues we've been causing in the past century or so.

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.