Cities around the world share many challenges. To address them, they need to develop science diplomacy

The mayor of Montréal, Valérie Plante, the mayor of Chicago, Brandon Johnson, and his counterpart from Milwaukee, Cavalier Johnson, at the annual conference of the Great Lakes and St. Lawrence Cities Initiative, on May 15, 2024 in Montréal. Cities must unite to discuss their major issues. (Canadian Press/Ryan Remiorz)by Rémi Quirion, McGill University
States should be more aware of how cities and local governments can help them carry out their diplomatic and scie