Korea Herald correspondent SHENZHEN, China -- The green and the hardware are not opposites in Shenzhen; they run on the same logic. The city that manufactures the world's gadgets is now manufacturing its image as a green one — and, increasingly, turning that green into a business. The first thing a visitor notices in Shenzhen may be the green license plates — reserved for electric vehicles — on car after car after car. To someone arriving from another Chinese city like Beijing, the number of ele