课程咨询

托福考试网 托福资料下载 托福资讯 0元讲座 水平测试

托福考试练习
新东方在线 > TOEFL > 托福听力 > 正文
托福培训

扫码免费领资料

内含托福全科备考资料

更有免费水平测试及备考规划

托福培训

扫码关注掌握一手留学资讯

回复XDF免费水平测试

录播精讲 直播课HOT

托福听力练习-科学美国人60秒:地球工程阻止热浪

2017-03-31 16:24:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：地球工程阻止热浪

　　科学美国人60秒听力练习：地球工程阻止热浪

　　科学美国人60秒英文文本

　　When Mount Pinatubo erupted in 1991, the injection of sulfur particles into the atmosphere cooled the planet. Taking inspiration from nature, some scientists have begun studying whether a man-made injection of such sulfate aerosols might stave off the worst of global warming. But could the technology also be used more locally to beat the heat?

　　That's the question explored by three U.C.L.A. scientists in a manuscript submitted to the journal Atmospheric Chemistry and Physics. Back in 2006, California endured a heat wave that lasted more than two weeks. The scientists ran a computer model to determine whether putting particles 12-kilometers up could cool the Golden State under such conditions.

　　The answer appears to be yes. Afternoon temperatures declined significantly in conjunction with the amount of particles boosted to the stratosphere. For example, emitting aerosols at rates of 30 micrograms per meter-squared yielded temperature decreases of roughly 7 degrees Celsius during the hottest part of the day.

　　It's unclear how exactly the sulfate aerosols would get to the stratosphere absent a volcanic eruption. There would be effects downwind in the desert Southwest, including potentially even less rain. And the sulfates might eat away at the protective ozone layer.

　　So the researchers suggest that we might want to forestall worse heat waves in the future a different way—by cutting back on the greenhouse gas emissions causing global warming.

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人

上一页 1 2 下一页

托福辅导

关注新东方在线托福

托福机经·Official题目练习

考前重点突破·听说读写海量资料

更多资料

关注新东方在线托福，
回复【XDF】获取大礼包

托福辅导
  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加】，回复对应关键字领取学习资料。
更多>>
更多内容

免费获取托福备考大礼包

微信扫描下方二维码 立即领取

托福辅导
更多>>
更多公益讲座>>
更多>>
更多资料
托福TPO 托福听力练习 托福口语练习 托福阅读练习 托福写作练习
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10