California is used to directing innovation in the automotive world. The environmental rules set in the state, if independent the 8th largest economy in the world, determine the production of the big car companies. So far, California, led by Elon Musk’s Tesla, is choosing electric cars powered by even more sophisticated batteries. There’s a different, arguably even cleaner and more sustainable way: Electric cars powered by fuel cells using sustainably produced hydrogen. That’s the way of Japan. The country is aiming to have 40,000 hydrogen-powered cars on its roads by 2020, with plans for a 20-fold expansion to 800,000 by 2030, according to a report released by the Ministry of Economy, Trade and Industry.