导语：今天，空气和水的污染对地球的健康构成了越来越大的威胁。每天机动车排放出成千上万吨的气体。工厂的烟雾污染了工业区和周边地区的空气……下面是一九文学网小编为大家整理的优秀英语演讲稿，欢迎阅读与借鉴，谢谢!

　　Man and His Environment

　　Throughout history man has changed his physical environment in order to improve his way of life. With the tools of technology he has altered many physical features of the earth. He has transformed woodlands and prairies into farms and made lakes and reserviors out of rivers for irrigation purposes or hydroelectric power. Man has also modified the face of the earth by draining marshes and cutting through mountains to build roads and railways.

　　However, man's changes to the physical environment have not always had beneficial results. Today, pollution of the air and water is an increasing danger to the health of the planet. Each day thousands of tons of gases come out of the exhausts of motor vehicles. Smoke from factories pollutes the air of industrialized areas and the surrounding areas of the countryside. The pollution of water is equally harmful. The whole ecological balance of the sea is being changed and industrial wastes have already made many rivers lifeless.

　　Now environmental protection is more pressing than ever before. As we know, massive destruction of environment has brought about negative effects and even poses a great threat to man's existence. Indifference to these problems will mean committing suicide. Therefore, effective measures should be taken and laws passed to conserve environment. Otherwise,man is certain to suffer from the serious consequences caused by this lack of care for his living surroundings.

　　【参考译文】

　　人与环境

　　纵观历史，人类为了改善生活方式而改变了自己的物质环境。借助于技术工具，他改变了地球的许多物理特征。他将林地和草原改造成农田和河流湖泊和水库，用于灌溉和水力发电。人类还通过排水沼泽和切割山脉来修建土地和铁路来改变地球的面貌。

　　然而，人类对物质环境的改变并不总是有益的。今天，空气和水的污染对地球的健康构成了越来越大的威胁。每天机动车排放出成千上万吨的气体。工厂的烟雾污染了工业区和周边地区的空气。水的污染同样有害。整个海洋生态平衡正在发生变化，工业废水已经使许多河流失去活力。

　　现在环境保护比以往任何时候都更加紧迫。我们知道，大规模的环境破坏带来了负面影响，甚至对人类的生存构成了巨大威胁。对这些问题漠不关心意味着自杀。因此，应该采取有效的措施，通过法律来保护环境。否则，人类肯定会因缺乏对生活环境的关怀而造成的严重后果。