Mr. Benson,
here is what I see in Wikipedia regarding jatropha,
"Goldman Sachs <http://en.wikipedia.org/wiki/Goldman_Sachs> recently 
cited /Jatropha curcas <http://en.wikipedia.org/wiki/Jatropha_curcas>/ 
as one of the best candidates for future biodiesel production.^[4] 
<http://en.wikipedia.org/wiki/Jatropha_oil#cite_note-3> However, despite 
its abundance and use as an oil and reclamation 
<http://en.wikipedia.org/wiki/Land_reclamation> plant, none of the 
/Jatropha/ species has been properly domesticated 
<http://en.wikipedia.org/wiki/Domestication> and, as a result, its 
productivity is variable, and the long-term impact of its large-scale 
use on soil quality and the environment is unknown.^[5] 
<http://en.wikipedia.org/wiki/Jatropha_oil#cite_note-Fairless-4> 
However, because jatropha can grow in harsh climates, it can be planted 
in areas where it won't compete for resources needed to grow food.^[6] 
<http://en.wikipedia.org/wiki/Jatropha_oil#cite_note-5>"the emphasis is 
my own.

Richard A. Fletcher

David B. Benson wrote:
> On Feb 24, 2:43 pm, "Don Libby" <[email protected]> wrote:
>   
>> ...
>> Yes algae is a promising feedstock, potentially yielding 100 times more
>> biodiesel per acre than soy, and 10 times more than palm.
>>     
>
> How about than Jatropha?
>
> And more crucially (at least to me just now) how much faster will
> algae grow using ordinary CO2 levels?  I've seen claims of 20x, even
> 30x, but these must be at enhanced levels of CO2, yes?
> >
>
>   

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