In the ongoing quest for cheaper biofuels, Lufthansa said last week that it had tested a 50-50 mix of petroleum and biofuel derived partly from tropical shrub jatropha that showed no damage to a jet engine after six months of flights and that costs two and a half times the price of traditional fuel. Scientists and companies in the U.S., backed by the Department of Agriculture, are working to increase yields on plants such as jatropha through genetic alteration to help continue bringing down the costs of biofuel.

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