Friends of the Earth, for example, says the efficiency of stoves is irrelevant if they burn renewable fuels such as dung or wood, as those in poor countries often do.
譬如，地球之友表示如果像在贫困国家那样，炉灶通常燃烧畜粪或木料等可再生燃料，那么其效用就与此无关了。
Friends of the Earth help to keep the environment clean.
地球的朋友帮助保持环境干净。
Nick Berning, a US spokesman for Friends of the Earth, described Hummers as "about the most highly polluting personal vehicles on the roads".
“地球之友”美国发言人尼克·贝尔宁把悍马汽车描述成“马路上污染最厉害的私家车”。
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