Beijing (UPI) Jun 18, 2013The Chinese city of Shenzhen has started the first of seven pilot emission trading schemes planned for China, the world's largest greenhouse gas emitter. Shenzhen, across the border from Hong Kong, is one of China's Special Economic Zones and is home to about 11 million permanent residents. It has committed to reduce the emissions intensity of its economy by 21 percent below 2010 levels Reported by Energy Daily 6 hours ago.