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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 Karen Hopkin , 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 has 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-ethnol 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 fossils and fuels.

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

And of course more CO2 in the atmospehere means more global warming.
So Biofuels may actually exggarate the problem they mean to solve.
Something to think about is we move forward on producing ego friendly fuels, as one of the scientist put it, we should make sure that our cure isn't worse than the disease.

Thanks for the minute, for scientific America's Sxity Seconds Science
I am Karen Hopkin



smile.gif Words
tout: If someone touts something, they try to sell it or convince people that it is good. 吹捧
ethnol: alcohol
you have been somone special to me_______.°`
On cherrysisi
For years, advocates have touted that the use of Biofuel is a clean burning alternative to gasolines.

Now a pair of study published in Feb eight issue of Science conclude that the biofuel may do more harm to environment than good.
The researchers calculated that the indirect costs of growing the crops that turn into the biofuels.

To plant the crops corn and sugarcane and soybeans from which bio-diesel and bio-ethanol are made,farmers would firstly clear the forests and grasslands.
That process turns out would generate more carbon dioxide that we save by swearing off our fossil fuel.
And it would take centuries for us to pay off that carbon debt.
For example, the scientitific figure that we take 319 years of using the ethanol from the soybeans to make up for the extra carbon released by chopping down the forests needed to grow the crops.
Of course, more co2 in atmosphere means more global warming. So biofuel may actually exacerbate the problem they mean to solve.
Something to think about is we move on forward on producing eco friendly fossil and fuel. As one of scientists puts it: we should make sure our cure isn't worse than the disease

you have been somone special to me_______.°`
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