From: "David B. Benson" <[EMAIL PROTECTED]>
Newsgroups: gmane.science.general.global-change
To: "globalchange" <[email protected]>
Sent: Saturday, October 04, 2008 5:49 PM
Subject: [Global Change: 2920] Re: Use olivine to remove carbon dioxide?
>
> On Oct 4, 2:27 pm, "Don Libby" <[EMAIL PROTECTED]> wrote:
>>... - but I'm not sure if just grinding
>> it up and dumping on the ground would be more cost effective.
>
> The paper claims an eventual price of only $14 per tonne of CO2.
> That's unbeatably6 low, it seems to me. [The starting price seems to
> be about $38 per tonne of CO2, about the same (on the high side) as
> turning wood into biochar and burying the biochar deep undeerground.
>
Other potential applications occur to me. Wisconsin uses an average of
20,000 tons of sand per year to provide traction on icy winter roads. That
is small potatoes compared to the use of sand for beach maintenance in
Coastal states. If the cost of mining and grinding olivine to sand and
stockpiling it could be offset by carbon credits, then the cost of spreading
it on roads or beaches could be covered by taxpayers as usual.
Of course, we would want to use carbon-free energy for mining, grinding, and
shipping olivine sand to ensure the process is net carbon negative.
-dl
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