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[科学美国人60秒] 【整理】SSS 2008-02-11

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on Sophi_a

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

For years advocates have touted 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 caculated the indirect cost of growing the crops that were 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 we take centuries for us to pay off that Carbon debt.
For example, the scientists figure out we 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 seal to the atmosphere means more global warming.
So Biofuels may actually exacerbate the problem they meant to solve.
Something to think about is we move forward on producing ego friendly fuels, as one of the scientists put it, we should make sure that our cure is worth than the disease.

Thanks for the minute, for scientific America's Sxity Seconds Science
I am Karren Hopkin.
我爱罗*英俊
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