Something to be thankful for.
There is an “argument from externalities” which holds that taxing carbon is a viable approach to reducing CO2 emissions. I reject the argument on the basis that externalities are almost always impossible to define or quantify. Because they are vague, they invite mischievous taxation schemes and market-distorting forms of rent seeking.
To keep everybody honest, externalities should be confined to litigation wherein an aggrieved party can show actual harm.