SSS 2009-12-22

In 2008 astronomers discovered surprising amounts of water molecules where planets were forming near young stars. But how, they wondered, could those molecules survive? They should have been destroyed by ultraviolet radiation. In theory, planetary du

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You may have never heard of him, but Thomas Midgley was considered one of the great chemists and inventors of his time. But perhaps no single person in history has done more harm to our earth. While working at a subsidiary of General Motors in 1921 h

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There is a special day to recognize the importance of the ozone layer. In 1995, the United Nations General Assembly decided September 16th is the International Day for the Preservation of the Ozone Layer. This is the date on which countries signed th

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And beyond that, on behalf of your mother and sisters, I pledge that we, your blood family, will do all we can to continue the imaginative and loving way in which you were steerling these two exceptional young men so that their souls are not simply i

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Global Pollution Trends According to a recent report by the UNEP 1 , if car numbers keep increasing at the present rate, there will be more than a billion on the road by 2025. Today, motor vehicles pu

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Global Warming and Ozone 全球变暖和臭氧 Could the coming century bring a new threat to the ozone layer? Discover one scientist's model of the effect of global warming and greenhouse gases on ozone -- on today's Earth and Sky. DB: This is Earth and S

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[00:-1.00]carbon monoxide motorway roadwork limit [00:-1.50]一氧化碳 汽车高速公路 长跑运动训练 界限 [00:-2.00]speed limit cone traffic cone zebra crossing [00:-2.50]速度限制 锥形物 锥形交通 斑马线 [00:-3.00]addiction c

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硕士研究生英语入学考试是一种水平测试、选拔测试，是为择优录取服务的教育测量手段。就阅读这一题型来说，据其在试卷中的分值比重、难易程度，所

(1)Springtime Ozone Loss

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高温天气下树木竟然会污染环境！

高温天气下树木竟然会污染环境！ Normally， trees are the best defence against pollution； but when it's too hot outside， the trees' own self－defence mechanism may actually make things worse。 正常情况下，树木是抵御污染

北京首要空气污染物PM2.5下岗 取代者臭氧危害更大

Warm days come with a downside, as masks can't stop pollutant at ground level in Beijing 温暖的天气也有一个不好的地方，那就是口罩挡不住北京地表层的污染物了。 Excessive ozone gas has become the prime pollution problem

万物简史 第227期:把铅撵出去(16)

On its website, a history of the company makes no mention of leador indeed of Thomas Midgleybut simply refers to the original product as containing a certain combination of chemicals. 在它的网站上，公司的历史没有提及铅──也没有提

万物简史 第216期:把铅撵出去(5)

Chlorofluorocarbons are also not very abundantthey constitute only about one part per billion of the atmosphere as a wholebut they are extravagantly destructive. One pound of CFCs can capture and annihilate seventy thousand pounds of atmospheric ozon

万物简史 第215期:把铅撵出去(4)

Buoyed by the success of leaded gasoline, Midgley now turned to another technological problem of the age. Refrigerators in the 1920s were often appallingly risky because they used dangerous gases that sometimes leaked. One leak from a refrigerator at

夏说英语新闻晨读 第166期:气候变暖怎么办

本期内容： Leaders from nearly 200 nations signed an agreement to phase out hydro fluorocarbons, chemicals used in refrigeration and air conditioning. In the 1980s the Montreal Protocol replaced chlorofluorocarbons, which were known to harm the