The U.S. Navy is touting its “Great Green Fleet,” but why haven’t biofuels made a bigger splash despite a decade of hype and investment?
technologyreview – Last week the U.S. Navy, with its accustomed pomp and fanfare, launched its first carrier strike group powered partly by biofuel—in this case, a blend made primarily from beef fat. The biofueled warships form a central element of the Navy’s Great Green Fleet program to draw half of its power from clean energy sources, rather than petroleum, by 2020.
Attended by secretary of the Navy Ray Mabus and agriculture secretary Tom Vilsack, the ceremony masked what has been nearly a decade of problems for biofuels—an energy source once touted as capable of virtually eliminating the use of petroleum in the transportation sector. Today biofuels production and consumption stand at a fraction of the levels foreseen under the Renewable Fuel Standard, a federal mandate signed by President George W. Bush that requires fuels made from corn, sugarcane, and other biological sources to be mixed into the nation’s gasoline supply. Tiếp tục đọc “The Problem with Biofuels”
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