Will we have done our earth justice?

That's an interesting question to me. Justice doesn't seem to have much to do with the earth in the way that nature feels to be fully able to treat all things with equanimity.

Nice that you found your insulators! Some of them are pretty valuable depending on when they were made and their color. I think they make interesting decorations. (If they weren't so heavy it might be fun to put them on the Christmas tree with some lights inside.)