单词：chlorofluorocarbons (cfcs)
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Unit 9 Everybody Can Help the Environment Part I Warming up Tape-script: Part I 1. Buy fresh food that doesn't need a lot of packaging. 2. Try to buy organic fruit and vegetables from farmers who don't use chemicals. 3. Save as much water as possible
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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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Task 2: A Work Qualification Test Script According to a report by Australian researchers, the hole in the ozone layer over Antarctica will probably start closing within five years. They say it may be completely closed within fifty years. The ozone la
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Section 29 Global Warming Some people say the earth is getting warmer. They blame something called greenhouse gasses. The greenhouse gasses destroy the higher atmosphere that keeps our planet from get
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ENVIRONMENT REPORT - November 1, 2002: Shrinking Ozone Hole over Antarctica By Cynthia Kirk This is the VOA Special English ENVIRONMENT REPORT. Australian researchers say the hole in the ozone layer o
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Good News: Earth's Ozone Hole is Healing 好消息:地球臭氧层空洞正在恢复 There is big news about the environment: Scientists say a hole in Earths protective ozone layer is starting to heal. 一则关于环境的重磅新闻来袭：科学家
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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
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