Guardian: The first mass production hydrogen cars, billed for more than a decade as a clean alternative to petrol and diesel vehicles but only glimpsed as concepts at automotive trade shows, have arrived on British roads. The most abundant element in the universe has added allure for carmakers in the wake of the Volkswagen pollution scandal and revelations about the gap between lab and real-world emissions tests. Leading the charge are South Korean manufacturer Hyundai, with a 53,000 crossover a squashed...