Foreign Affairs: China is the worlds worst polluter -- home to 16 of the 20 dirtiest cities and the largest emitter of greenhouse gases. Recent headlines have been shocking: 16,000 decaying pig carcasses in Shanghais Whampoa River, dire air quality reports in Beijing, and hundreds of thousands of people dying prematurely because of environmental degradation. Most recently, the country has been shaken by a mysterious virus, H7N9, which has already killed six people and has spurred health authorities to order the...