Many agricultural crops are processed into consumer products, often resulting in the generation of processing wastes. The types of wastes produced are numerous and varied. Among those most frequently mentioned as potential bioenergy and bioproduct feedstocks are cotton gin trash, waste fats and greases, whey (from cheese processing), and food industry wastes (e.g., cull fruits and vegetables, fruit and vegetable seed pits, citrus peels and pulp, nut shells, fruit and vegetable pumice, and seafood shells among other items).