1. defi ning energy effi ciency as "doing more with less, as opposed to suffering hardships or closing businesses"). See also 42 U.S.C. � 6291(5) (defi ning energy effi ciency as "the ratio of the useful output of services from a consumer product to the energy use of such product);A Bipartisan Strategy to Meet American's Energy Challenges,2001
2. Ford Foundation, A Time to Choose: American's Energy Future;Energy Policy Project,1974
3. Figure 1.14. U.S. energy consumption by sector (1949‑2008)