How about an area we can put money into too counteract pollution. The cost could be based on tech, land, and population. Give nations, mainly the small low income ones the ability to counteract the damage being done.
How about the ability to sell our polution and trash off to smaller more desperate nations who nned the cash! Liek they do in the real world.
Better yet, have the option to drop it in the in the ocean. We could have a world polution index along with the rad index.