If only they had any kind of track record of criminal prosecution of greenhouse gas emitters. Sure, they issue fines and such, but no one ever gets prosecuted. This guy got hosed because he made the mistake of not being a fortune-500 company, not because he broke the law.
Companies are busted for cheating emissions tests all the time, whether vehicular or at factories and power plants, and there are almost never criminal prosecutions for doing so. Heck, just take a drive on a freeway some time and count the number of vehicles that are obviously violating emissions standards, many of which have out-of-date registration because they can't pass the inspection, so they are breaking the law when emitting excessive and illegal greenhouse gases. None of those folks are being criminally prosecuted. I guess VW executives did actually get jail sentences, but I bet those were about the fraud rather than the emissions. The coal industry has a long history of gratuitous violation of emissions and other pollution standards, largely without criminal prosecutions. I'd be very surprised if the same isn't true of pretty much every industry of reasonable size (large enough to have lobbyists, basically) in the economy. So long as penalties come only in the form of economic consequences, those consequences are just factored in as the cost of doing business and behaviours don't change other than to be more thoroughly disguised. The EPA and other regulators are thwarted from going after corporate violators both by the expense and difficulty of trying to prove individual culpability within a corporation and also by the ridiculous protections offered to corporate officers by our courts.
Congress needs to pass laws that explicitly make the c-suite employees and board members individually culpable for the actions of their companies even when they aren't explicitly aware of them or else nothing is actually going to change except for folks like the guy in this story, who lacks the protections a corporate structure would have provided him..