"The use of plant oil as fuel may seem insignificant today. But such products can in time become just as important as kerosene and these coal-tar-products of today."
-Rudolf Diesel in the year 1912 in his application for a patent, in a time where energy crises, climate changes and ozone holes not yet were discussed.
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AboutBioDiesel.com has a quote from Rudolf Diesel on their Buying Biodiesel page: