That completely depends on what qualifies as meaningful. From a rational point of view, every impactful change came by regulation, which is a proxy for force. After all, what's going to happen when you break this regulation? That doesn't mean that regulation would solve this particular crisis though. The best you can achieve with national regulation is pollution and that's just not gonna stop the coming climate disaster.

And you're mistaken wrt what I labeled dumb: I specifically phrased it in the context of actions, not people.