We all reduced CFC use and stopped ozone depletion.

The problem with climate change is that there is a huge incentive to not fix it, and the culprit is not just rich oil corporations. Many countries subsist solely on oil profits and have no other natural resources to sustain themselves, i.e. Saudi Arabia. Those countries have influence over others like the US.

There are alternative options already available to replace fossil fuels for most things. In first-world countries, the only thing stopping a transition is the loss of corporate profits.