[wtfsvi]

This would be all good if pollution stayed in one place. But it will be impossible for you to prove that pollution was the cause of the warm weather that caused your failed crop. Not even to mention proving who should pay you. The same is true about normal air pollution. Setting up an operation to figure out who was responsible for polluting what air would be really expensive if it would be possible at all. I don't know who you expect to do that.