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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A Lot of Scope Seen for Improving Energy efficiency.

在提高能源使用效率方面还有很大潜力。

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The biggest chunk, around a quarter, is going on improving energy efficiency.

其中最大的一笔开销，其四分之一的金额将用于提高能源利用率。

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On the plus side, the foundation acknowledged that substantial progress had been made in improving energy efficiency in both new and existing homes and reducing fuel poverty among vulnerable groups.

BBC: NEWS | Business | Homebuyers 'face growing worries'

The "Green" quasi-religion spreading around the world will really take hold in the U.S. President Bush is not about to follow Australia and ratify the Kyoto Treaty, but America continues to throw billions of dollars at improving energy efficiency.

FORBES: Christopher Helman On Energy

Yet, despite the real energy cost savings and environmental benefits associated with improving home energy efficiency, a series of barriers have prevented a self-sustaining retrofit market from forming.

WHITEHOUSE: THE WHITE HOUSE