变废为宝 who wants used garbage
知识扩展
protecting the environment is a hot topic all over the world these days. if you're going to talk about this subject with a native-english speaker, here are some words you'll want to know.
现如今，环境保护已经成为一个世界性的热门话题。如果你要和外国人谈论这个话题，下面的这些词要事先知道哦。
environmentalist n.环保者，环境论者
tree-hugger n.环境保护狂（有贬义、讽刺的意思）
conservation n.保存，保持,守恒
sustainable development 可持续发展
greenhouse gas 引起温室效应的气体
pollution n.污染
global warming 全球变暖
solar energy 太阳能
hydro energy 水能