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.
他说，更好的做法是提高能源利用效率，在特定汽车市场主要使用天然气而且合理进行风能和太阳能发电设施的持续建设。
It would be better, he argues, to improve energy efficiency, rely on natural gas in niche vehicle markets and balance continued construction of wind and solar power to produce electricity.
虽然从长远来看，他们能得到收益，但是某些家庭或企业主可能没有钱负担提高能源使用效率的费用。
Some home or business owners may not have the money to finance efficiency improvements, even if they would pay off in the long run.
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