I think those two tariffs are the best place to raise costs because they can be increased incrementally, state by state or country by country. The main problem with the regulatory approach is that it's a "big bang" post-board approach. Nothing happens until the regulation is defined and deployed, and corporations are experts at delaying implementation.
Yes, increasing tariffs means touching many individual regulatory domains at the state and municipal levels, but like deploying solar energy or wind power, you can do it incrementally.