[Terrapreta] value of carbon credits

[Gerald Van Koeverden]

No, but some greenhouse growers (for plug transplants and potted  
plants, not vegetable growers who use coconut coir) use them a lot...

I was thinking about them, not so much for obtaining huge carbon  
credits, but the potential for commercial development of char.

G.

On 15-Apr-08, at 11:37 AM, Greg and April wrote:

> Gerald,
>
> Don't forget the cost collecting the biomass and charring it in the  
> first place.
>
> On another note - I have never heard of farmers applying perlite,  
> vermiculite or peat moss wholesale to their fields - have you?
>
> Greg H.
>
> ----- Original Message -----
> From: Gerald Van Koeverden
> To: Terra Preta
> Sent: Tuesday, April 15, 2008 1:06
> Subject: [Terrapreta] value of carbon credits
>
> If the sequestering of char became accepted for carbon credits, how  
> much would the carbon credit have to be to justify the cost of  
> doing so?
>
> Using Folke's formula, modified by Sean's factor of 90%:
>
> Burying 1 kg of Carbon is equivalent to sequestering 3.7 kg CO2.   
> Since 1.1 kg of char has 1 kg of carbon, one ton of char would be  
> the equivalent to 3700/1.1= 3,400 kg. of CO2.
>
> From previous discussions, we've heard that a ton of char should be  
> worth $200 - roughly the equivalent of that of charcoal.
>
> Thus, if one expects carbon credits to pay the full cost of the  
> char (ignoring shipping and application costs), then the credits  
> have to be approx. (200/3.4=) $60/ton of CO2.
>
> If one is going to promote putting char on farmer's fields, the  
> credits will have to be close to this, especially since there are  
> still trucking and application costs to be considered.
>

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