Cities are stepping up to address the world's thorniest challenges, from climate change to migration. Ian Bremmer sits down with three mayors from across the globe to talk about how their cities are taking on the world's most pressing problems.

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What does the world look like when power goes unchecked? And who ultimately pays the price? David Miliband and Ian Bremmer discuss the biggest takeaways from the latest edition of the Atlas of Impunity and why the abuse of power can take many forms: from governments to corporations to environmental destruction.