[Gasification] new studies on GHG footprint ofbiofuels darkensthepicture

[Greg and April]

That's why I like the idea of Terra Preta - some of it is recovered as 
energy the rest of it is sequestered and then the cycle of growth starts 
over again.

Greg H.


----- Original Message ----- 
From: "Max Kennedy" <vacuum1313 at yahoo.ca>
To: "Discussion of biomass pyrolysis and gasification" 
<gasification at listserv.repp.org>
Sent: Tuesday, February 12, 2008 6:10
Subject: Re: [Gasification] new studies on GHG footprint ofbiofuels 
darkensthepicture


> As you note the short rotation fuel cropping doesn't fall in this 
> scenario.  Nor does the mature wood scenario unless you burn it all in 1 
> year and some carbon sequestration remains beind in stumps and roots which 
> are significant if you've ever tried to remove them.  Also this carbon is 
> already in circulation so displacesa like amount of new carbon from fossil 
> fuels.  I cannot see any math saying that this is worse than using fossil 
> fuels!
>
> Max K
>
>
> ----- Original Message ----
> From: Kevin Chisholm <kchisholm at ca.inter.net>
> To: Discussion of biomass pyrolysis and gasification 
> <gasification at listserv.repp.org>
> Sent: Monday, February 11, 2008 9:23:18 PM
> Subject: Re: [Gasification] new studies on GHG footprint ofbiofuels 
> darkens thepicture
>
> Dear Greg
>
> Greg and April wrote:
>> Funded for, and promoted by anti biofuel fanatics.
>>
>> Notice how the data that "proves" their point, is not accessible for 
>> review
>> by the general public.
>>
>
> It annoys me also, when they issue such pronouncements, and don't give
> the reasons and data behind their pronouncements.
>
> However, in this case they are basically right for part of the story
>
> For example... here in Nova Scotia, it takes about 40 years to grow 40
> cords of wood on an acre of land. Say 60 tonnes. Allowing for limbs,
> tops, and culls, this might be 80 tonnes per acre, or say 2 tonnes per
> acre per year. If I cut this acre and sell it off to people for fuel
> wood, then in one season, I release 40 years worth of carbon capture.
>
> On the other hand, I avoided the need to burn fossil fuel and bring "new
> Carbon" into the Biosphere.
>
> In the greater scheme of things, if I had 40 acres in continuous
> rotation, 1 acre per year over 40 years, the carbon release from this
> year's cut would be enough to provide for the carbon requirements of 40
> acres of previously harvested land, so there is no net carbon addition
> to the Biosphere.
>
> This is where they go wrong.... they only tell one side of the story.
>
> Best wishes,
>
> Kevin
>> Greg H.
>>
>> ----- Original Message ----- 
>> From: "Max Kennedy" <vacuum1313 at yahoo.ca>
>> To: "Discussion of biomass pyrolysis and gasification"
>> <gasification at listserv.repp.org>
>> Sent: Monday, February 11, 2008 17:12
>> Subject: [Gasification] new studies on GHG footprint ofbiofuels darkens
>> thepicture
>>
>>
>>
>>> Don't know if it's already posted.  The following I am told are direct
>>> links to the online publications at "Science" on the biofuel GHG 
>>> darkening
>>> reports.  if this is duplication I apologise.
>>>
>>> http://www.sciencemag.org/cgi/content/abstract/1152747
>>> http://www.sciencemag.org/cgi/content/abstract/1151861
>>>
>>> Max K
>>>
>>>
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>>
>>
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>>
>
>
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