Tokyo is setting a global example in urban sustainability with its Green Roof Law, which mandates that at least 20% of rooftop space on new buildings larger than 1,000 square meters be covered with vegetation. Enacted in 2001, this policy aims to combat the urban heat island effect, improve air quality, and enhance biodiversity in one of the world’s most densely populated cities. Green roofs help regulate temperatures, reduce energy consumption, and absorb rainwater, minimizing the risk of flooding.
Over the years, this initiative has led to the creation of thousands of green rooftops across Tokyo, improving the city’s resilience to climate change. Studies show that green roofs can lower surrounding air temperatures by up to 4°C, reducing the demand for air conditioning and lowering carbon emissions. With increasing global interest in nature-based urban solutions, Tokyo’s success serves as a model for other cities looking to integrate sustainability into their infrastructure. More