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Propane was my fuel of choice for my X-Prize car, as it is available widely and burns clean. Fracing has been going on for decades, I worked for the Western Co in the '70s and it was "well" established then. On of the secret, "chemicals" we used was powdered dry beans. When mixed with water it caused the water to thicken and become very slippery, thereby holding more frac sand and greatly reducing the HP required for pumping. Methane digesters should be given the same tax breaks for farmers as the solar panels are, all that cow poo could be put to good use.
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