Guest: David Miller, former mayor of Toronto

Former Toronto Mayor David Miller was always an advocate for the environment. But in the nearly 14 years since he left office he's become one of the world's great networkers for climate solutions, bringing together mayors from 96 cities to share policy ideas, programs and practices. In this episode of "This Matters," Miller discusses why municipal governments are best positioned to rapidly deploy climate solutions and the ways he's seen mayors make outsized impacts far beyond the boundaries of their cities by "hacking" their position to reduce emissions.

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