I see this argument a lot that "if only they priced in externalities the numbers would come out in favor of electricity" but I haven't seen a calculation of tho

I see this argument a lot that "if only they priced in externalities the numbers would come out in favor of electricity" but I haven't seen a calculation of those externalities that isn't effectively just making up a number. Like I just picked one from a .edu https://scarab.bates.edu/cgi/viewcontent.cgi https://scarab.bates.edu/cgi/viewcontent.cgi and it's just comical with 980% externalities. A number that can be turned into actual policy seems impossible to reach. It seems like the way forward is just make the thing you want people to do cheaper than the status quo, artificially or not, and let people's economic incentive kick in. But if it's artificial you can't do a California and rug pull net metering.