We can make a consideration for any plan that has research to back them turning significant profits within five years, as it is doubtful that any such plans will be profitable 20 years down the line.
And of course, those profits will be taxed severely since we know any such plans will be quite disruptive to the environment, and none of these companies will clean up their own messes, so the government will have to do the job. Might as well force them to pay for it ahead of time, and maybe some extra on the side that'll go to critical public services like transit or healthcare.
Without such guarantees? F-them.