People have talked about Bitcoin as a "battery", where you can use it to absorb excess electricity and then use the Bitcoin you earn to pay for the electricity elsewhere, but that's super dumb because then the energy is being used twice.
Using excess methane power bitcoin miners puts an economic incentive on flaring gas and reducing the amount going into the atmosphere.
(Except even when "gas" is cheap it's expensive compared to, say, renting machines at AWS or Azure to get computations done.)