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  3. Disappearing Forests 　　The world’s forests are disappearing. As much as 1/3 of the total tree cover has been lost since agricult

Disappearing Forests 　　The world’s forests are disappearing. As much as 1/3 of the total tree cover has been lost since agricult

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答案 Disappearing Forests 　　The world’s forests are disappearing. As much as 1/3 of the total tree cover has been lost since agriculture began some ten thousand years ago.The remaining forests are home to half of the world species, thus becoming the chief resource for their survival.Tropical rainforests once covered 12% of the land of the planet. As well as supporting at least half of the world species of plants and animals, these rainforests are home to millions of people. But there are other demands on them. For example, much has been cut for timber. An increasing amount of forestland has been used for industrial purposes or for agriculture development such as crop growing. By 1990s less than half of the earth original rainforests remained, and they continued to disappear at the alarming rate every year. As a result, the world’s forests are now facing gradual extinction.
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