急求一篇关于全球变暖的英文演讲稿!500字左右!

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急求一篇关于全球变暖的英文演讲稿!500字左右!
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Global WarmingThere is little doubt that the planet is warming.Over the last century,the planets temperature has risen by around 1 degree fahrenheit (0.6 of a degree celsius).The warmest since the mid...