Are you a douche bag driving a huge SUV and feeling guilty about all the smog you produce?
If so, then you can, of course, buy yourself some comfort on the open market. The idea is that you can purchase emission credits from the open emissions exchange from a smog producing company. By reducing the number of credits a company has it reduces the amount of crap they can spew into the air.
This is exactly the type of idea a Libertarian tree hugger would come up with. The idea is that if enough people purchased credits and didn’t use them, then companies would be forced to upgrade their emission systems because they wouldn’t have the extra credits they normally would have purchased on the open emissions exchange.
Interesting to say the least.