It’s meant to be the antithesis of the polluted, climate-threatened megacity. A “forest capital” with no smog, no traffic jams, no overflowing sewage and no encroaching seawater. Instead, Indonesia’s new capital has solar-powered trains, flying taxis and buildings ensconced in the green jungle like some sci-fi “Star Wars” city — or at least it will, someday, according to the master plan. Nusantara is one of the most ambitious city-building projects ever. And it’s now up and running — sort of. Reporter Patrick Winn went to see for himself.