Given that the existing amount of US regulation is zero, and California's regs are brand new, what else could be brought to the table? Maybe more, but there's also the potential for some mischief.
While we're not naming any names, firms whose partners might potentially contribute to winning political campaigns of the future, and which can successfully advise clients to do the same, may be positioned to help determine the content, if not the spirit, of climate related regulations and treaties under a future administration. From that, could come even political appointments.
I'm not sure if TH knows that Vinson & Elkins was Enron's counsel. They have a picture of Enron's sign being taken down.