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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Smoke rises after an Israeli strike on Beirut's southern suburbs, following an escalation between Hezbollah and Israel amid the US-Israeli conflict with Iran, on March 6, 2026.

REUTERS/Khalil Ashawi

The Lebanese militant group’s strikes against Israel on Monday appear to have given the Israelis the pretext to launch a massive counter-attack, with the ultimate aim being to disarm the Iran-backed group once and for all.