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[科学美国人60秒] 【整理】SSS 2008-07-02

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on Cqheyan

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

 

Methane is a greenhouse gas that traps heat even better than carbon-dioxide.It comes from a variety of sources including fossil fuel production and even farming.Cows give off methane you know after they eat.Even the surface waters of the ocean contain substantial amounts of this gas,but where marine methane comes from was a mystery until now.Scientists collected seawater off the coast of Hawaii,and they found that bacteria that live in those waters scarf up certain phosphorous-containing chemicals,and then release methane as a by-product.The results appear online in the Journal Nature Geoscience.What's surprising is that scientists had previously thought that methanes are only produced by bacteria that live in places where there is no oxygen.Think of the smell you associate with a swamp or with the muck at the bottom of a murky pond.This marine methane could contribute to global warming by adding more greenhouse gases to the atmosphere.What's worse,the hotter it is,the more stressed these seafaring bacteria get and the more methane they are likely to put out,which was certainly not the kind of feedback that atmosphere scientists were hoping to get.

 

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

坚持下去,享受下去...
That man is coming back again...
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