Agricultural chemistry encompases the science and technology of producing not only edible crops, but feedstocks for fuels ("biofuels") and materials.  Ethanol fuel obtained by fermentation of sugars.  Biodiesel is derived from fats, both animal- and plant-derived.  Methane can be recovered from manure and other ag wastes by microbial action.  Lignocellulose is a promising precursor to new materials.