If we let the markets have their way, Earth becomes unhabitable. Coal and oil plants aren't being shut down. In fact, we have more than ever with additional ones on the way.

It's because "free market" is and always has been a misnomer. Free to ignore externalities, yes. But our shared ecosystem is not seen as a market participant, so it can't charge the true cost of burning hydrocarbons.

We'd also still have industry dumping raw waste directly into our waterways. I'm not so sure that this wouldn't have killed more people faster than unregulated coal/oil plants.