All major world governments needed to nationalize or brutally regulate polluting industries decades ago. They didn't, and it's tough to see a path forward now even assuming the political will to do so somehow appeared out of the ether.
a) cut back on carbon emissions personally, and climate change will be undone
b) do nothing and let climate change take its course
but the reality is the option for your average consumer is
a) cut back on carbon emissions personally, and whatever happens to the world will happen regardless because you're only a microscopic contribution to the problem/solution
b) do nothing, and whatever happens to the world will happen regardless because you're only a microscopic contribution to the problem/solution