Christian Science Monitor: Yokohama, Japan — Fill ‘er up — with hydrogen. It may still sound like science fiction to some. But Japan is taking a lead in making zero-emissions hydrogen-fueled cars a reality. It’s part of the country’s aspiration to cut its carbon emissions 80 percent by 2050; nearly a quarter of those emissions come from transportation. And it’s a more urgent task in a country that imports all of its oil. Japan leads Asia in early hydrogen-car infrastructure and is a world-beater …