As a result, U.S. refiners have continued to produce large amounts of high-sulfur diesel.

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What it does have (and must have, as a starting point for the diamonds) is lots of coal: dirty, high-sulfur-content coal, which feeds 75% of the country's primary energy requirements.

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In other words, U.S. refiners are exporting U.S. high-sulfur distillates instead of refining it into low-sulfur diesel fuel than can be sold in the U.S. Chile, Mexico and several other countries in Central America have been the leading export markets for high-sulfur U.S. diesel.

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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.

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With production capacity for high-quality, low-sulfur crude offline in Libya, Yemen and Sudan, the cartel is unable to compensate.

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The oil, from producers in western Canada, is gooey, acidic and high in sulfur--harder to refine than benchmark West Texas Intermediate (light, sweet) crude.

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The process that smokestack "scrubbers" use to reduce nitrogen oxide and sulfur dioxide emissions creates high-quality synthetic gypsum, said Robert E.

CNN: Turning toxic coal ash into bridges, buildings