USA BUSH BIODIESEL

U.S. President George W. Bush (R) puts a handkerchief up to his face after it was held above a truck exhaust as the engine was revved up in a demonstration of clean burning biodiesel fuel during his tour of the Virginia BioDiesel Refinery in West Point Virginia, Monday 16 May 2005. Next to Bush is Douglas Oberhelman, left, Group President of Caterpiller, Inc., who built the engine used in the demonstration. (UPI Photo/Matthew Cavanaugh/POOL)