Russell, I haven't had time to read through the article you posted,
but I came across this fact the other day and thought you might be
interested to know.  Lightning storms are part of the nitrogen cycle
of the earth, and it accounts for approximately 5-8% of the nitrogen
fixed in the soil.

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/N/NitrogenCycle.html

I'm still pondering the phosphorous issue.  It seems like it all
eventually ends up in the water, and could be recovered from algae
growth or extraction of lake and sea floor sediments?

On 5/14/07, Russell McMahon <apptech@paradise.net.nz> wrote:
> cellulose bio-mass
> based ethanol is not only unsustainable as a fuel but has a severe
> cost far in excess of its value and causes unaffordable long term
> damage to the agricultural systems on which it depends.
>
>         http://culturechange.org/cms/index.php?option=com_content&task=view&id=107&Itemid=1
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