One asks to what degree do we not know the costs? And these costs aren't ketchup economic prices but actual primary environmental effects. You can't buy your way out of those by having the central bank provide more liquidity.

> A market solution would be based upon true supply and demand and agreement on price in buy / sell transactions.

This is worse because the market not only has no way to price these cost but it is _blind_ to them. That you don't realize this means you think 'free markets' are 'magical'

> A tax representing the "externality" is just a politically made-up number. So it's sort of free market but not really.

FTI: Your free markets don't exist without politics.