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New Geoengineering Scheme Tackles Ocean Acidification, Too

Posted July 23, 2008 8:22 AM

From Wired: Top Stories:

A scheme to dump quicklime into the oceans to sequester more carbon in their depths is being revived by a British management consultant with backing from Shell. First proposed back in the '90s by Exxon engineer Haroon Kheshgi (.pdf), the idea takes advantage of a series of simple chemical reactions. Limestone, at high temperatures, breaks down into carbon dioxide and quicklime, in a process that produces greenhouse gas. But dump that quicklime in seawater, and it absorbs roughly twice as much CO2 as was released in the first reaction.

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The Engineer
Engineering Fields - Engineering Physics - Physics... United States - Member - NY Popular Science - Genetics - Organic Chemistry...

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#1

Re: New Geoengineering Scheme Tackles Ocean Acidification, Too

07/23/2008 3:14 PM

Here's a bad idea.

Guest
#2

Re: New Geoengineering Scheme Tackles Ocean Acidification, Too

07/24/2008 10:03 AM

You'd have to dump in quite a lot, though. Try 4 billion tons. Per year. Over decades.

Even assuming its ecological side effects are relatively benign (a big "if"), the scheme has little chance of being implemented, according to Ken Caldeira of Stanford University's Carnegie Institution, who described the plan as "unrealistic" and a mere "theoretical possibility."

Guru
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#3

Re: New Geoengineering Scheme Tackles Ocean Acidification, Too

07/24/2008 11:13 AM

While we're about it, let's dump several thousand tons of iron filings in the ocean every year to enourage algal growth and sequester yet more CO2. That's been proposed before too, y'know!

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#4
In reply to #3

Re: New Geoengineering Scheme Tackles Ocean Acidification, Too

07/24/2008 2:03 PM

Not only proposed but actually tested.

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Guru
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#5

Re: New Geoengineering Scheme Tackles Ocean Acidification, Too

08/05/2008 2:17 AM

Hello EnviroMan

That system actually works very well, and is an ecologically sound method.

Kind Regards....

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Guru
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#6

Re: New Geoengineering Scheme Tackles Ocean Acidification, Too

08/05/2008 2:21 AM

You've just got to ask why Shell Oil is proposing that idea.

There's just got to be money, lots of it, for them, if that nutty scheme goes ahead.

I note that Shell proposes to use "limestone from sites adjacent to gas and oil wells", sites which are under the control of Shell, of course.

Ecologically unsound idea, entirely.

Kind Regards....

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