Smog.
China is already the world’s second-biggest producer of greenhouse gas emissions and is expected to surpass the United States as the biggest. Roughly a third of China is exposed to acid rain. A recent study by a Chinese research institute found that 400,000 people die prematurely every year in China from diseases linked to air pollution.
Nor does China’s air pollution respect borders: on certain days almost 25 percent of the particulate matter clotting the skies above Los Angeles can be traced to China, according to the United States Environmental Protection Agency. Environmental experts in California predict that China could eventually account for roughly a third of the state’s air pollution.
The biggest problem being, of course, that half an hour later, you want to start breathing again.
*snort* Oh man, that was bad, Dave. *snort*