While new buildings integrate sustainability from the ground up, Hong Kong's innovators haven't forgotten existing structures. The solution? A revolutionary coating that turns any surface into a passive cooling system.     Dr. Martin Zhu / i2Cool "Our electricity-free cooling paint, already applied to the Coliseum's roof, cuts AC demand by 300,000 kWh yearly. It's like giving buildings their own sunscreen—keeping interiors comfortable without energy-intensive cooling."     This breakthrough cooling paint doesn't just imitate nature—it elevates it, turning buildings into self-regulating ecosystems.     Martin / Student, City University of Hong Kong: "Our inspiration came from the Sahara Desert's silver ants—tiny survivors that flourish under scorching heat. Their secret? A remarkable surface structure with self-adjusting hairs that naturally regulate temperature. We've mimicked this brilliant design, translating nature's genius into advanced materials right here in Hong Kong."     Iris / Host:   "What's the science behind this game-changing paint?"     Martin / Student, City University of Hong Kong   "At its core are specially engineered nanoparticles that work like microscopic mirrors and radiators. They reflect harsh sunlight while absorbing building heat, then transform that energy into infrared waves between 8-13 microns—nature's perfect cooling wavelength. The result? Powerful, electricity-free temperature control."     Already transforming over 100 construction projects, this technology is reshaping urban landscapes. We spoke with its co-developer, Professor Tso Chi Yan.     Professor Tso Chi Yan / i2Cool Co-founder "Imagine entire cities adopting this technology—urban temperatures could decrease by 1-2°C, significantly easing the heat island effect. This isn't just about comfort; it's a critical tool for hitting our 2030 carbon peak and 2060 neutrality goals. Every cooled building becomes part of the climate solution."     Envision buildings as living organisms: from construction to operation to renewal. By embracing low-carbon methods and circular material use, we're not just designing structures—we're cultivating sustainable ecosystems. This is how architecture evolves from merely green to truly regenerative, standing the test of time while protecting our planet's future.