The road not yet taken

摘要

In his State of the Union speech this past January, President George W. Bush declared, "It's in our vital interest to diversify America's energy supply." He then went on to outline what he called "ambitious goals": reducing gasoline consumption by 20 percent in 10 years, boosting use of gasoline alternatives to 35 billion gallons over the same period, and incrementally increasing automobile fuel efficiency standards.