1978年，中国开始了一项全国性的植树计划，即三北防护林计划，也被称为“绿色长城”。

In 1978, China began a nationwide tree-planting programme known as the Three North Shelterbelt Forest Programme, also known as "the Great Green Wall".

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这个大型植树计划目的在于减少大气中二氧化碳的含量，二氧化碳是造成全球变暖的原因。

This massive tree-planting scheme aimed to reduce the amount of carbon dioxide in the atmosphere, the cause of global warming.

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环绕她的叶子来自枫树、橡树，和几十个其他物种，这些都是20世纪70年代所制订的一个积极的植树计划的结果。

The leaves that surround her are from maples, oaks, and dozens of other species, the result of an aggressive tree-planting program in the 1970s.

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