Yahoo!: The United States ranks No. 8 among the world's most energy-efficient nations, while the clean-energy powerhouse Germany holds the top slot, a new report found. Oil-rich Saudi Arabia, perhaps unsurprisingly, landed with a thud at the bottom of the list. The American Council for an Energy-Efficient Economy (ACEEE) ranked 23 of the worlds top energy-consuming countries for its 2016 international scorecard, released Wednesday. Energy-efficient steps include outfitting buildings with intelligent...