[xienze]

> IMHO that should also apply to land ownership rights which should also expire after some time. How can we say with a straight face that granting people, institutions or corporate entities rights to own a piece of the Planet Earth in perpetuity, forever, is fair or a good thing that is sustainable?

Who's granting people perpetual ownership of a piece of land? Once you stop paying taxes on it, the state will take it back.

> but I think land should be only leased for a limited time, like the max lifespan of a person, ~100 years or so, and then expire, never owned in perpetuity by any individual or corporation.

I mean in a practical sense this is exactly what happens. You die -> taxes are no longer paid on the land -> someone else gets it. That "someone else" is either an heir who is now paying tax on it, or its sold to someone else entirely.