The disadvantages of a decentralized, spread out urban area are tremendous, and the environmental damage of urban sprawl cannot be ignored. As a large city, Tokyo must be used more efficiently and the population density increased.
Minoru MoriBy using vertical space more effectively, you not only make more room for greenery but shorter commutes also mean less pressure on CO2 emission problems and by freeing up time now spent on unproductive commuter trains, people would have more options in their lives.
Minoru Mori