Actually, I did hear about CFCs being successfully replaced and the ozone hole closing. The reason that happened was that CFCs were replaced with something almost identical, manufactured by the exact same companies.

With fossil fuels, there is no straightforward direct replacement. They have to be replaced with something completely different, not merely slightly different, and the companies that make them will go out of business if such a change is implemented. Needless to say, they'd sooner kill every last one of us than allow that to happen, and so far, they're on track to succeed in their destroy-all-humans plan.