Ironically, while U.S. exports of high-sulfur diesel have risen from roughly 1% to nearly 12% of the total domestic diesel supply, U.S. imports of low-sulfur diesel have jumped from less than 1, 000 barrels per day in the first half of 2006 to well over 100, 000 barrels per day.

FORBES: Magazine Article

For energy, more than a billion tons of coal -- a quarter of the world's total output -- are burned every year, coating metropolitan areas with sulfur dioxide, soot and smoke.

CNN: China's industrial growth fuels major pollution problems