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ENERGY-CELLULOSE/
RTX6F2W 
June 02, 2008 
A clerk attends to a customer at a UPI energy gas station in Chatham, Ontario, in this April 11, 2008... 
Chatham, Canada 
To match feature ENERGY-CELLULOSE/ 
A clerk attends to a customer at a UPI energy gas station in Chatham, Ontario, in this April 11, 2008 file photo. In the search for renewable energy, turning low-value materials like switchgrass and corn husks into ethanol to fuel cars is something of a Holy Grail.But scientists on the front lines of this search are finding that making the process commercially and environmentally viable is proving much harder than some of the hype would suggest. To match feature ENERGY-CELLULOSE/ REUTERS/Mark Blinch/Files (CANADA) 
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