In the United States, deciduous trees planted along the south side of buildings can reduce air conditioning costs by 20 percent, the U. S. Environmental Protection Agency has advised.

美国环境保护署(Environmental Protection Agency)建议说，在美国，沿建筑物南侧栽种落叶树可以使空调费用降低20%。

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In the United States, deciduous trees planted along the south side of buildings can reduce air conditioning costs by 20 percent, the U. S. Environmental Protection Agency has advised.

美国环境保护署(Environmental Protection Agency)建议说，在美国，沿建筑物南侧栽种落叶树可以使空调费用降低20%。

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