Thoughts from Ron Bailey, on running out of stuff. I found this interesting:

The folks at the GPRI point out that the phosphorus in just one person’s urine would be close to the amount needed to fertilize the food supply for one person. So why not recycle urine? In fact, NoMix toilets have been invented which allow for the collection of urine separate from solid wastes, allowing phosphorus and nitrogen to be recovered and used as fertilizer. In addition, crop biotechnologists are exploring ways to produce plants that dramatically increase the efficiency with which they use phosphorus, which would reduce the amount fertilizer needed to grow a given amount of food.

Urine recycling would be not just handy, but perhaps crucial, for space settlements.

On the broader point, as long as we have affordable energy and knowledge there’s no reason to run out of anything. The biggest problem is the overabundance of stupidity on the part of those who would rule our lives.