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Biodiesel still requires combustion 

Thank you for the cover story. This alternative fuel for all types of combustion engines is not new ("From homebrew to pay-at-the-pump," May 26-June 2).

The operative words are "combustion engine."

Therein lies the perpetuity of the pollution problems. The claimed less greenhouse gases, the less amount of particulates, less of everything except the oxides of nitrogen are a window dressing.

The fact we are calling the alternative "diesel" means its molecular composition definitely includes carbon atoms.

For each carbon atom in the molecule of the biodiesel, one molecule of carbon dioxide is produced, and for a pair of two hydrogen atoms in the molecular composition we get one molecule of water, provided the combustion is 100 percent efficient, which is never likely in any combustion engine. If the fractionated biodiesel is of low carbon content, only then the emission of greenhouse gas is likely to be low. The lowest emission is only possible if the refined biodiesel is like natural gas, used in homes. Very unlikely.

The use of biodiesel will remain a fancy for the few and an ego trip, to be exploited by the politicians for their personal ambitions.

Thank you, Abraham Hyatt, for trying.

Brahama D. Sharma

Pismo Beach 

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