When ICLEI Southeast Asia Secretariat was started over two decades ago, we posed a question: Could cities lead the fight against climate change? Two decades later, the answer is clear—they already are.

Through 160+ partnerships and 60+ transformative projects, ICLEI Southeast Asia has supported local governments in embedding zero emissions, nature-based, resilient, circular, and equitable principles into urban development. But the most critical lesson? Sustainable cities thrive on collaboration—across sectors, levels, and borders.

As we mark our 21st anniversary, we’re not just reflecting on milestones. We’re accelerating the momentum toward a future where every city is a climate leader.

Because the cities of tomorrow aren’t a distant dream—they’re being built today. And we’re committed to supporting them, every step of the way.

Watch the ICLEI Southeast Asia corporate video below: