北师大版高中英语模块7--Unit 22 Environmental 2 [00:02.31]Forests [00:03.63]The world's forests are the natural habitats [00:05.99]for millions of species of plants, [00:08.33]insects, birds, reptiles and mammals. [00:11.68]They also help produce clean oxygen. [00:14.47]Because of illegal logging, [00:16.33]forest fires and climate change, [00:18.49]the world's forests are disappearing [00:20.59]at the rate of 146,000 square kilometers a year [00:25.92]That's about the same size as Nepal. [00:28.60]At one time, half the land on the Earth's [00:31.24]surface was covered by forest. [00:33.11]Today, it is about a quarter. [00:35.56]The WWF spends US$40 million a year to protect [00:40.80]existing forests and to plant new trees [00:43.29]in deforested areas. [00:47.97]Oceans [00:49.38]About two thirds of the Earth's surface [00:51.59]is covered by the seas [00:53.23]which are home to millions of species of plants [00:55.66]and animals. [00:57.10]The sea is also an important source of food [00:59.50]for all of us. [01:00.63]Without the seas, we could not live. [01:02.80]But, because of pollution and over-fishing, [01:05.39]many marine species are in danger. [01:07.81]The WWF has the largest marine conservation [01:10.84]programme in the world, [01:12.83]and works closely with goverments [01:14.42]to protect sea life. [01:15.35]

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