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1.What happened ¡¡¡¡¡¡¡¡¡¡the polar bear in the photo? 

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2.What’s the author’s purpose ¡¡¡¡¡¡¡¡¡¡writing this text? 

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3.According ¡¡¡¡¡¡¡¡¡¡the specialists,the global climate has led to many evident consequences. 

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4.The polar bear had to travel greater distances in order ¡¡¡¡¡¡¡¡¡¡find enough food. 

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5.This alarming case showed how the greenhouse effect had an impact ¡¡¡¡¡¡¡¡¡¡¡¡¡¡Earth’s ecology. 

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6.The heat is released back ¡¡¡¡¡¡¡¡¡¡space at longer wave lengths. 

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7.Greenhouse gases ¡¡¡¡¡¡¡¡¡¡the atmosphere keeps Earth’s climate warm and habitable. 

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8.Greenhouse gas emissions will result ¡¡¡¡¡¡¡¡¡¡further warming. 

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