Just a couple of points;
ASIDE:
It seems that from a 'capitalist' POV more money can be made from
destruction of a thing as that means what is left becomes more
expensive. So, 'renewability' just as 'communability' make no sense
because no one can gain massive imaginary wealth.
The clip below is only partially correct; if the 'manures' (green or
animal) are left on top, the methane produced by the bacteria will enter
the atmosphere quickly (but for a brief period). However, if animal
waste is properly worked back into the soil and a "catch crop" is
planted, there will be very little methane leached into the atmosphere;
the nitrogenous compounds being utilized by the new crop and held there
until that is plowed in for the 'money crop' planting time. If one
wishes to maintain a healthy farm, one returns as much plant (or animal)
waste back to the land as possible; or the land (floral and faunal
biomasses) will starve and die (note this will still show a wonderful
'carbon deposition' in the soil structure but is /unavailable/ to
plants) and that moves up the chain to the macro biota. Also the soil
structure is damaged by having little to no carbonaceous materials
creating compaction where there is a predominance of clay or extreme
permeability where there is a preponderance of sand *=* no good farming
area.
Which leads us to a /nasty/ habit in agriculture these days that assumes
there is and always will be an abundance of carbon (carbonaceous
materials) in any farmland area. /*NOT SO!!!*/ Beautiful southern
Ontario farmland of 1 century ago by 1990 was showing signs of
desertification. "But we have fertilizers, we don't need plant matter."
Hmmm? Fertilizers = fossil fuels.... butt that's another story.
Butt any large metro area with high human populations should be able to
supply lots of 'bio-waste' for gassification plants even though the
resulting 'composted human manure' may have too many toxins to be used
for agricultural purposes (heavy metals, hormones [estrogen], or
antibiotics).
Now we can have another field of work: detoxifying what remains after
the bio-gas generation so it can be utilized as a growth medium or soil
amendment.
Darryl
On 12/11/2010 8:27 AM, Ray Harrell wrote:
it is made from
biological waste that in many cases would otherwise decompose in farm fields
or landfills and yield no benefit at all, releasing heat-trapping methane
into the atmosphere and contributing to global warming.
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