What said Rudolf Diesel ?

"Der Gebrauch von Pflanzenöl als Kraftstoff mag heute unbedeutend sein. Aber derartige Produkte können im Laufe der Zeit ebenso wichtig werden wie Petroleum und diese Kohle-Teer-Produkte von heute."

"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, were not yet discussed