You could think that the spectacular Hyundai N Vision 74 sports coupe concept is just a retro-futuristic model that will never see the light of day… and while that might be partly true, the brand is serious about what powers the wedge-shaped two-door.The N Vision 74 runs a fuel-cell powertrain – put hydrogen in, the fuel-cell stack turns it into electricity (with water being the only byproduct), and the car blasts towards the horizon thanks to twin electric motors on the rear axle.The technicalities of the powertrain are immense – there’s a lot going on here. But the company is also working on a simpler solution with hydrogen power, that being using traditional internal combustion engines to run the zero-tailpipe-emission fuel.Read more about the Hyundai Other brands are toying with the notion of powering their cars on hydrogen fuel, too. And indeed, Hyundai has the Nexo…