Everything I've seen suggests that the thermal mass of the Yellowstone magma reservoir is order-of 10km each way (so 1000km^3 total), density order-of 3 kg/litre, and heat capacity order-of 1500 J/kg K, so lowering the temperature of that reservoir by 100 K would still yield about the entire world's energy consumption in 2017: https://www.wolframalpha.com/input?i=1000km%5E3+*+3kg%2Fl+*+...
Even though this would combine both left-coded and right-coded aspects of the USA's politics (right: the USA's love of energy intensity; left: in this scenario it helps the environment not be made of fire), I find it dubious that the US would (or could) construct enough power plants to reach that scale.
(China might even want to help, but at this point I find myself too cynical of both China and the USA for that to happen even in an emergency).
Are you sure?
Everything I've seen suggests that the thermal mass of the Yellowstone magma reservoir is order-of 10km each way (so 1000km^3 total), density order-of 3 kg/litre, and heat capacity order-of 1500 J/kg K, so lowering the temperature of that reservoir by 100 K would still yield about the entire world's energy consumption in 2017: https://www.wolframalpha.com/input?i=1000km%5E3+*+3kg%2Fl+*+...
Even though this would combine both left-coded and right-coded aspects of the USA's politics (right: the USA's love of energy intensity; left: in this scenario it helps the environment not be made of fire), I find it dubious that the US would (or could) construct enough power plants to reach that scale.
(China might even want to help, but at this point I find myself too cynical of both China and the USA for that to happen even in an emergency).