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Confronting the fact that national leaders aren’t going to do enough, María Carlini, the newly elected 27-year-old mayor of Mexico City, calls a World Cities Summit, inviting the mayors of the largest cities from all around the world.

Over 150 city leaders assemble, together representing a billion people, and one-third of the world’s economy. They realize that they don’t need to wait for their national leaders to act.

The cities commit to the 2035-Zero goal: for the combined emissions of all of these citizens to be zero by 2035. This goal is measured collectively – cities that had a head start in transitioning to renewable energy invest in technology to capture greenhouse gases, to offset the emissions by cities that start later. The cities work together, pooling their resources and sharing information about how to change.

These changes immediately make life better for the inhabitants of these cities. Air pollution clears up, there are waves of new jobs in green tech, and there are more green spaces. Megacities become even more desirable places to live, and more people move to them.

There’s still a lot of inequality, though. What should we do about that?