TOKYO — A few years ago, a colorful new accessory suddenly began to appear on the lapels of dark-suited salarymen across Japan: a small badge, shaped like a roulette wheel and divided into 17 rainbow-colored sections.Soon, the logo was seemingly everywhere, proudly displayed in hip boutiques, at children’s playgrounds and on the websites of Buddhist temples.The object of that zeal? The 17-point U.N. framework known as the Sustainable Development Goals.S.D.G.s, as they are called, encourage every nation on earth to become a better place, with such hard-to-argue-against aspirations as ending poverty, improving education and reducing inequality.But perhaps no country has embraced the campaign as visibly as Japan, where it has offered a chance to demonstrate the country’s good standin …
