Youth activists at the 2025 World Mayors Summit are collaborating with cities and mayors to implement climate solutions on the ground, with the Bloomberg Youth Climate Action Fund expanding to support 300 cities worldwide. The EU has endorsed CHAMP for stronger climate action, while the C40 World Mayors Summit showcases projects in C40 cities focusing on clean energy, urban design, and air quality. City-business collaboration is highlighted as crucial for accelerating climate action ahead of COP30. Local leaders at COP30 stress the importance of collaboration and partnership in achieving national climate goals, working on over 2,500 local projects to channel climate finance for both mitigation and adaptation. Mayor of Rio Eduardo Paes emphasizes the role of city leadership in shifting COPs from negotiation to delivery, calling for greater inclusion of cities and subnational governments as true partners in the process. The message is clear: local leadership is ready to work alongside world leaders to turn ambition into action and promises into progress.