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。
Using alternative fuels and improving energy efficiency is thus both an ecological necessity and a technological challenge.
当我们防止物质的浪费、提高能源效率或提高资源生产率时，我们就节约了资金、提高了盈利能力并增强了竞争力。
When we prevent physical waste, increase energy efficiency or improve resource productivity, we save money, improve profitability and enhance competitiveness.
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。
By 2007, DuPont was saving $2.2bn a year through energy efficiency, the same as its total declared profits that year.
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