Tree hugger: A term, sometimes derogatory, refers to an overenthusiastic environmentalist.
这个常用语是对极端环保人士的一种带有批评和蔑视的称呼，有时也用来嘲讽那些极端环保人士。在使用时要注意说话的对象。
造句：She is such a tree hugger that she would not hesitate to tell you those plastic shopping bags are not environmentally friendly if she sees you are using them.