Acrophobes and the faint of heart need not apply. All others will be delighted to discover that the alpha male of skyscrapers, the Empire State Building, has reinvented itself as a supergreen structure. A top-to-bottom, four-year renovation of the historic landmark began in 2009, with the chief goal of maximizing energy savings. Like King Kong, construction workers clambered around the storied 102-story building, barely noticed by the stream of office workers and visitors tha