Sadiq Khan is one of the most prominent global politicians advocating for green issues. Since becoming Mayor of London in 2016, he's put the fight against climate change and air pollution front and centre - declaring a climate emergency, introducing the world's first Ultra-Low-Emission Zone, and committing to make London net zero-carbon by 2030.

That said, it hasn't been an easy journey, something Khan told Marie Claire UK this week as he released his debut book, Breathe: Tackling the Climate Emergency.

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