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2013北师大版高二下Unit 22《Environmental Protection》(Lesson 1)ppt课件

  • 课件名称:2013北师大版高二下Unit 22《Environmental Protection》(Lesson 1)ppt课件
  • 创 作 者:佚名
  • 课件添加:admin
  • 更新时间:2013-3-10 10:09:33
  • 课件大小:810 K
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  • 授权方式:免费版
  • 运行平台:Win9x/NT/2000/XP/2003
  • ◆课件简介:
    2013北师大版高二下unit22《Environmental Protection》(Lesson 1)ppt课件br1 Global Warming In groups discuss What you know about global warming. Look at the pictures to get ideas. Traffic Jam Factory The Greenhouse Effect The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane, for example) trap energy from the sun. Without these gases, heat would escape back into space and Earth’s average temperature would be about 60oF colder. Because
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