posted 10 years ago
I grow potatoes, corn, peas, beans, and other vegetables and then I eat them. Then I use the fuel to do useful work like growing vegetables, weeding, and moving myself and my stuff from place to place.
My neighbor grows alfalfa, and uses it to fuel horses, which help with the hay harvest and with transportation.
My grandfather grew wood and used it to fuel a steam engine which was used to thresh the wheat harvest. My father grew wood and used it to fuel the wood stove which kept us warm in the winter. The trains that brought my ancestors to this place were fueled by wood.
Ethanol can be derived from most fruits or grains.
Methanol can be obtained by distilling wood.
Biodiesel can be derived from nuts or other seeds. In my climate, rape/canola is the most productive oil producing plant. I could burn walnut oil in the tractor, but why would I want to burn an oil that sells for around $64 per gallon? I certainly can't make walnut oil for such a low price.
Methane can be derived from anaerobic decomposition of organic materials, and burned as fuel directly, or compressed for transport.