Tokyo used rooftop rainwater and AI-powered spraying to fight extreme urban heat; study finds potential to cool buildings and cut air-conditioning demand and reducing the intensity of heat waves

Rooftop rainwater harvesting: Tokyo's rooftops may offer a new strategy for extreme heat management. Rainwater harvesting and roof sprinkling systems can cool buildings effectively. Machine learning optimizes tank size and sprinkling intensity for better performance. This system's cooling benefits grow significantly during hotter years.