Coolers don't work in high humidity. Tokyo is uncomfortably humid in summer months. As for the other suggestions, it is impossible to bring this at a scale of

Coolers don't work in high humidity. Tokyo is uncomfortably humid in summer months. As for the other suggestions, it is impossible to bring this at a scale of a city like Tokyo. Asphalt is a basic commodity of durable construction. So is cement. Plenty of trees and public pools/fountains/water bodies in and around Tokyo.