北師大版高中英語(yǔ)模塊8--Unit 22 Environmental 3

[00:01.94]Fresh water [00:03.71]Rivers, lakes and wet-lands are sources [00:06.23]of fresh water,not only for humans, [00:08.50]but for wildlife too. [00:10.35]Due to pollution and climate change, [00:12.60]about 50% of the world's fresh water habitats [00:15.09]have been destroyed in the last 100 years. [00:19.15]And more than 3 billion people [00:21.04]in poor countries [00:22.31]do not have enough clean water. [00:25.35]The WWF works hard to protect fresh-water [00:28.53]environment from pollution and to help people [00:31.87]in developing countries have access to safe, [00:34.93]clean water. [00:36.58]Nobody knows exactly how many species of plants [00:39.27]and animals there are on Earth. [00:41.45]Scientists say that there would be as many as [00:44.08]15 million different species. [00:46.06]Sadly, many species have become extinct [00:48.92]and many are in danger of extinction. [00:51.63]But thanks to the hard work of organizations [00:53.59]like the WWF, [00:55.55]more and more have a chance to survive. [00:57.23]

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