I think a crucial difference between the two cases is that non-pollution makes it even more profitable for others to pollute, which would make collective non-pollution (in the absence of a collective agreement) an unstable node. (For example, using less oil bids down the price and extends the scope of profitable uses.)
Wow. This is a really important point. I’d never realized that.
Wow. This is a really important point. I’d never realized that.