The climate change discussion gets bogged down in the hypothetical and abstract so often.
ITT you are the dictator of the world, which means all political impediment to your desired solutions are moot. You can literally do anything but you are also responsible for all externalities.
Explain your idea, but also anticipate the externalities and how you might mitigate those.
Mine would be the creation of a global research agency with two main focusses; carbon capture and green energy.
This would be incredibly expensive but I would mitigate costs by diverting all of the worlds weapons research into this task. The people who work in weapons research would be retrained to work for this agency.