Hyundai Motor Co believes hydrogen fuel cell vehicles are the future for eco-friendly cars despite challenges of limited infrastructure and slow sales. South Korea’s largest automaker has sold or leased 273 Tucson fuel cell SUVs since beginning production in 2013, lower than its 1,000 target, mostly in Europe and California. Fuel cell cars represent a bigger opportunity than electric cars because competition is less fierce. Hydrogen-powered cars also give more flexibility to designers. They can be scaled to big vehicles such as buses as well as small cars.