he Principle of Energy Conservation Energy conservation 1850-1975 energy consumption increased exponentially In 1970s, projection prediction 4.3%a year, 160Q Btu by 2000 1996,938QBtu/yr Oil embargo in 1973, the cost of energy rose very steep The increased fuel costs coupled with federally-sponsored energy conservation programs and help from public utilities and various community organizations have provided the incentives, education, and means for a significant drive toward a reduction in the use of energy The remarkable achievement In 1973 the ratio of energy consumption to gDP was 27X Btu/s 1990. decreased to 20X103 Btu/S 复旦大学环境科学与工程系 Department of Environmental Science and Engineering, Fudan UniversityEnergy Conservation The Principle of Energy Conservation 1850-1975 energy consumption increased exponentially In 1970s, projection prediction 4.3% a year, 160QBtu by 2000 1996, 93.8 QBtu/yr. Oil embargo in 1973, the cost of energy rose very steeply. The increased fuel costs, coupled with federally-sponsored energy conservation programs and help from public utilities and various community organizations have provided the incentives, education, and means for a significant drive toward a reduction in the use of energy. The remarkable achievement: In 1973 the ratio of energy consumption to GDP was 27×103 Btu/$. 1990, decreased to 20×103 Btu/$ ≠