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[科学美国人60秒] 【整理】SSS 2008-02-11

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This is Scientifc America's Sixty Seconds Science.
I am Carrie Hocken, this'll just take a minute.

For years advocates have touted the use of Biofuels as a clean burning alternative to gasolines, 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 / caculated the indirect cost of growing the crops that turned into Biofuels, to plant the corns, sugarcanes and soybeans from which Bio-diesel and Bio-? are made, farmers would first need to clear forest and grass lands, that process turns out would actually generate more carbon dioxide than we would save by swearing off fossil fuels.

And it would take centuries for us to pay off that Carbon debt.
For example, the scientist ?? it would take 319 years of using ethanol made soybeans to make up for the extra carbon released by chopping down the forest needed to grow the crop.

And of course more seal to the atmospehere means more global warming.
So Biofuels may actually exacerbate the problem they mean to solve.
Something to think about is we move forward on producing equal friendly fuels, as one of the scientist put it, we should make sure that our cure is worthy than the disease.

Thanks for the minute, for scientific America's Sxity Seconds Science
I am Carrie Hocken
The KALEIDOSCOPE of life
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