[Hidden-tech] Biodiesel

[Andy Klapper]

True, except one has to factor in any fossil fuels used to power the plant
that manufactured the bio-diesel, the fuel used by farm equipment to grow
the source crop (and the fertilizer), any non-bio-diesel fuel used to move
the crop from the farm to the factory, and from the factory to the pump.
Bio-diesel made from used cooking grease I guess you could exclude the farm
side of things, but you still have the factory fossil fuel consumption.

For Ethanol this cost is surprisingly high.

I'm sure in the end it's better than burning straight fossil fuels, and you
could reduce the amount by running the farm equipment on bio-diesel, and get
the power for the factory from a Nuclear power plant.  But zero it is not.



Andy.

        There is a very important point that is yet to be brought up.
Biodiesel
is zero-carbon cycle -- any CO2 it emits, was the CO2 the plants has
absorbed from the air first; unlike fossil-diesel, which releases carbon
which had been sequestered by the plants hundreds of millions years ago.
So, *effectively*, the carbon emissions of biodiesel are zero.

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