[__MatrixMan__]

On the demand side, I imagine you'd be drawing fuel gas from a rig that's like, in your neighborhood, being powered by the solar panels on your roof. So you'd probably notice if there were tanker trucks showing up to fill it.

On the supply side, you could use things like methane sniffing satellites (https://www.nature.com/articles/d41586-024-00600-z) to find cases of extraction and tax (at first) or arrest (eventually) those participating in it.