The Tokyo Olympic Games in 1964 left a mark on the world in the form of the Shinkansen high-speed train, a feat which this year's repeat hosts look to match with a vision of the future of civic planning.

While enduring some criticism for going through with the games during COVID-19, Tokyo has presented the world with the first hydrogen-powered Olympics, complete with an entire fleet of hydrogen fuel-cell vehicles, a hydrogen-powered pair of stadiums, a hotel, and Olympic village.

Hydrogen power, not to be confused with hydro-electric power, is foreseen by some as the obvious renewable energy of the future. As the most abundant element in the universe, hydrogen fuel-cells produce no emissions of any kind except for water, which can be used to irrigate agriculture or gardens.