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SSS 2008-02-11

时间:2010-05-13 02:28来源:互联网 提供网友:0922013129   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science. I am Karen Hopkin, this'll just take a minute.

For years, advocates have touted1 the use of biofuels as a clean burning alternative to gasoline, now a pair of studies published in the Feb 8 issue of Science conclude that biofuels may do more harm to the environment than good.

The researchers calculated the indirect costs of growing the crops that turned into biofuels. To plant the corn or sugarcane or soybeans from which bio-diesel and bio-ethanol are made, farmers were first need to clear forest and grasslands2. That process it turns out would actually generate more carbon dioxide than we save by swearing off fossil fuels and would take centuries for us to pay off that carbon debt. For example, the scientists figured it would take 319 years of using ethanol made from soybeans to make up for the extra carbon released by chopping down the forests needed to grow the crop. And of course more CO2 in the atmosphere means more global warming. So Biofuels might actually exacerbate3 the problem they are meant to solve. Something to think about as we move forward on producing eco-friendly fuels, as one of the scientists put it, we should make sure that our cure isn't worse than the disease.

Thanks for the minute, for Scientific American's 60-Second Science. I am Karen Hopkin.


点击收听单词发音收听单词发音  

1 touted 00151f908b31d984fd20d8b48dba34f3     
v.兜售( tout的过去式和过去分词 );招揽;侦查;探听赛马情报
参考例句:
  • She's being touted as the next leader of the party. 她被吹捧为该党的下一任领导人。
  • People said that he touted for his mother and sister. 据说,他给母亲和姐姐拉生意。 来自辞典例句
2 grasslands 72179cad53224d2f605476ff67a1d94c     
n.草原,牧场( grassland的名词复数 )
参考例句:
  • Songs were heard ringing loud and clear over the grasslands. 草原上扬起清亮激越的歌声。 来自《现代汉英综合大词典》
  • Grasslands have been broken and planted to wheat. 草原已经开垦出来,种上了小麦。 来自《简明英汉词典》
3 exacerbate iiAzU     
v.恶化,增剧,激怒,使加剧
参考例句:
  • WMO says a warming climate can exacerbate air pollution.世界气象组织说,气候变暖可能会加剧空气污染。
  • In fact efforts will merely exacerbate the current problem.实际上努力只会加剧当前的问题。
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