As I usually say, if some German aristocrats want the old manor back, they need just go to Poland and buy it.

But that costs money, and shouldn't the Germans be compensated for having their homes expropriated 60 years ago?

No. When a person commits a crime, he is punished. The same is true for nations. The expropriation can well be considered a fine on a national scale.

And the fact of the matter is that Germans are much richer than Poles, so it shouldn't be terribly expensive to buy the old places back. The fact that it's not happening en masse shows that this issue is mainly hot air.

Peak oil is not an energy crisis. It is a liquid fuel crisis.