It takes five to 10 days for the pollution from China's coal-fired plants to make its way to the United States, like a slow-moving storm. It shows up as mercury in the bass and trout caught in Oregon's Willamette River. It increases cloud cover and raises ozone levels. And along the way, it contributes to acid rain in Japan and South Korea and health problems everywhere from Taiyuan to the United States. This is the dark side of the world's growing use of coal. Source: Yahoo News, 11/04/07
