The tidbit about the caskets is not thoroughly researched. I didn’t want to know any more than I had to about the deterioration of remains than I already do. It’s a pretty generous approximation. A lot of factors come in to play when it comes to how long a corpse lasts. Based on what she knows about the land & circumstances Alex’s guess is probably accurate enough. Remains placed in wooden coffins, with no vault, return to the soil in about 50 years. Bones take the longest to decompose. After that time if anything remains it tend to crumble if it’s disturbed at all. If the soil is dry the time can be extended much farther.
I always used to wonder what the world would look like once we ran out of places to store corpses. With every bit of unclaimed land filled we’d probably do what we do with too many people, which is stack them. Once I got older I found out that this is what we already do with them when space is at a premium. Once the money runs dry, & there’s no one left to care, then we finally let whatever remains return to the earth.
The legality of human remains & what you can & can’t do with them is a pretty complex area unless you’re taking a superficial glance at it. In a lot of places once you plant a corpse nothing can move them apart from a lot of money. As with most things money reduces laws and ordinances to dust. Generally gravesites are considered public property, but are privately funded, with some money coming from taxes to keep care of graves no longer claimed by extended family. It varies from place to place, country to country, so pretty much anything you say is true someplace.
When I used to be in to paranormal stuff, before it got salted by logic, I used to think how odd it was that Native Americans buried their dead seemingly at random in places that made great locations for houses and stuff. I naively thought that someone actually researched the legends of “ancient indian burial grounds” instead of just making shit up because no one ever bothers to.
As far as remembering stuff goes you still can’t outdo paper when it comes to cost and longevity. When everything else vanishes in a puff of electromagnetic pulsing, paper remains, unharmed. I’ve often thought about what would happen to my work if an electrical disaster happened that wiped clean all electronics. Essentially only human memory, and a few printings of the first, like, 300 pages or so would remain. The culmination of everything I’ve ever done and been would be wiped from the earth. Of course, sooner or later, that’s going to happen regardless. So I decided not to worry about it too much and just see what happens.