Sadiq Khan, the city’s first Muslim mayor, says: ‘We are united by something far more fundamental, our belief in the power of politics to change people’s lives for the better’

While the soon-to-be first Muslim mayor of New York, Zohran Mamdani, was in the final throes of his mayoral campaign on a brisk day in New York, Sadiq Khan, the first Muslim of mayor of London, was wrapping up a two-day climate summit in a steamy if overcast Rio de Janeiro.

“Hope is not gone,” Khan told the 300 city mayors gathered in the Brazilian city’s museum of modern art.