There are many different kinds of pollution in our world. Pollution is the introduction of chemicals or substances that have a harmful effect on the environment. It is very common to hear about pollution in the air and water, but have you ever heard of light pollution? Light pollution is a man-made problem, and it has increased about 50% in the last 20 years. We all enjoy the convenience of electric lights; they make life safer and easier.
在我们的世界当中有许多不同种类的污染。污染是指引入对环境有害的化学品或物质。常听到空气污染和水污染，但是你曾听说过光污染（或称光害）吗？光污染是人为问题，过去二十年以来增加了约 50%。我们都享受电灯带来的便利；它们使生活更安全也更轻松。
生活必备字词：
pollution n. 污染
substance n. 物质
harmful a. 有害的
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本文节录自《常春藤生活英语》杂志，完整内容请见五月号。
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