植树节演讲稿绿色森林是人类生命的摇篮。因此世界上有许多国家都越来越重视植树造林，并有了法定的植树节。但世界上最早的植树节，是美国内部拉斯加州制定的。美国内布拉斯加州树木稀少，土地干旱，风沙很大。为了改善这种恶
today is tree-planting day. we went to plant trees in daning greenland. as soon as we arrived, we began to work.some we