By 2007, DuPont was saving $2.2bn a year through energy efficiency, 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。

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Using alternative fuels and improving energy efficiency 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。

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When we prevent physical waste, increase energy efficiency or improve resource productivity, we save money, improve profitability and enhance competitiveness.

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。

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Why do we need energy efficiency experts? Introducing them means hitting the energy monopolist over the head.

VOA: standard.2010.02.03

to put in place policies that incentivizes people to use things such as energy efficiency

他们制定了一些政策，鼓励人们使用能效高的产品，

全球变暖与国力 - SpeakingMax英语口语达人

He said Russia will none-the-less continue to push for domestic energy efficiency and cuts in carbon emissions.

VOA: standard.2009.12.25

John White, executive director of the Center for Energy Efficiency and Renewable Technology, told The New York Times.

NPR: Can U.S. Go 'Green' Even When Oil Prices Drop?

My recommendation is to spend half your money improving the energy efficiency of your house.

FORBES: With $2,000 To Spend, What's The Most Effective Way To Reduce One's Carbon Footprint?

And it offers free improvements to increase the energy efficiency of your home, if you qualify.

BBC: Battling bills - what help is there?