I agree pollution from the industrial revolution started long ago (i.e. King James I) and it's killed people recently (i.e London 1952). I agree the correct rat

I agree pollution from the industrial revolution started long ago (i.e. King James I) and it's killed people recently (i.e London 1952). I agree the correct rate is non-zero. There should be some average rate that approximates whatever instantaneous rate would have been instantaneously perfect. We have the benefit of being able to look backward on this era with near-perfect information. A proposal for taxation for externalities that is historically calibrated has a chance of being adopted. Otherwise, it's just fist shaking and chanting "externalities".