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。

youdao

Fourth, enhance exchanges of experience in improving energy efficiency and environment protection.

第四，加强在节能、环保等方面的经验交流。

youdao

A total of 210bn yuan of the stimulus money is earmarked for environmental protection projects and improving energy efficiency.

总计有2100亿元刺激计划资金被指定用于环保项目和提高能源效率。

youdao

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'

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

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?