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[–]ActuallyNot 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

It's likely that he's underestimating the social cost of carbon by putting it at $250 per tonne.

In 2018, the Intergovernmental Panel on Climate Change suggested that a carbon price from $135 to $5,500/tCO2 in 2030, and from $245 to $13,000 in 2050 (2010 US dollars), would be needed to drive carbon emissions to stay below the 1.5 °C limit.

So he could easily be underestimating by a factor of 30 or 40.