If technology becomes good enough, the policy problem is irelevant.
Once solar and wind, without any subsidies, are cheaper than coal, then societies will switch purely out of self interest.
No prisoner's dillema solution needed.
Once solar and wind, without any subsidies, are cheaper than coal, then societies will switch purely out of self interest.
No prisoner's dillema solution needed.
If coal prices included the negative externalities costs - in other words, if we charged coal companies for dumping their trash into our collective air instead of subsidizing them by letting them do it for free - it would greatly change the price comparison. Then the market would likely do the rest.