By 2007, DuPont was saving $2.2bn a year through energyefficiency, the same as its total declared profits that year.
直至2007年，杜邦通过提高能源效率，每年能节省22亿美元，这与其当年公布的总利润相当。
2
Using alternative fuels and improving energyefficiency is thus both an ecological necessity and a technological challenge.
因此，使用替代燃料和提高能源效率既是生态需要，也是技术挑战。
3
When we prevent physical waste, increase energyefficiency or improve resource productivity, we save money, improve profitability and enhance competitiveness.