What is expensive is replacing all the current energy infrastructure. Even if you went out and just re-built coal power stations and oil refineries it would cos

What is expensive is replacing all the current energy infrastructure. Even if you went out and just re-built coal power stations and oil refineries it would cost trillions. We sometimes forget in first world countries that a lot of the reason we are so wealthy is because we have an enormous stock of physical capital paid for over the centuries.