请问哪里有有关温室效应的介绍短篇下载（英文）

http://www.google.cn/search?q=greenhouse+effect+&client=aff-9991&ie=GB2312&oe=utf8&hl=zh-CN&channel=footer

What is Greenhouse Effect ?
The ¨Greenhouse Effect〃 is a term that refers to a physical property of the Earth's atmosphere. If the Earth had no atmosphere, its average surface temperature would be very low of about -18? rather than the comfortable 15? found today. The difference in temperature is due to a suite of gases called greenhouse gases which affect the overall energy balance of the Earth's system by absorbing infra-red radiation. In its existing state, the Earth-atmosphere system balances absorption of solar radiation by emission of infrared radiation to space (Fig. 1). Due to greenhouse gases, the atmosphere absorbs more infrared energy than it re-radiates to space, resulting in a net w