北師大版高中英語(yǔ)模塊8--Unit 22 lesson1-1

[00:04.53]Unit 22 Environmental Protection [00:08.85]Lesson 1 Global Warming [00:12.39]Can we take the heat?In the last few decades, [00:16.95]environmentalists have reported [00:19.02]that human beings are causing changes [00:22.29]in the Earth's climate-something previously [00:25.41]seen as beyond our control. [00:28.56]They claim that since the Industrial Revolution [00:31.55](1750)and especially in the last 50 years, [00:35.25]gases pumped into the Earth's atmosphere [00:38.08]by our factories and vehicles [00:40.47]have been speeding up the process of global [00:43.16]warming and there by affecting our climate. [00:47.40]Scientists believe that global warming [00:49.93]could be one of the biggest environmental [00:52.46]problems facing the 21st century, [00:55.62]but what exactly is global warming [00:58.57]and why is it seen as a threat? [01:02.02]Global warming refers to an average increase [01:06.07]in the Earth's temperature that, [01:08.32]in turn,leads to climate change. [01:11.93]Scientists found that the temperature [01:14.31]of the Earth is controlled [01:15.67]by greenhouse gases such as carbon dioxide, [01:19.46]that trap heat from the sun [01:21.87]in the Earth's atmosphere. [01:23.77]Without these naturally occurring gases, [01:26.79]the sun's energy would be radiated [01:29.61]back into space leaving the earth could [01:32.41]and unsuitable for life. [01:32.41]

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