I strongly suspect that Dr. Singh just might have some thoughts on viable feedstocks and worthwhile technology breakthroughs...in other words ways to make biofuels feasible in different markets around the world. Too bad we probably won't be able to entice him to debate with you in this forum.
Sorghum species are both edible and poisonous (depending on which): Horse farmers go the extra mile to get rid of this plant.
symptoms: urinary incontinence and dribbling of urine are common in both mares and males, predisposing the horse to cystitis in the prolonged presence of clinical signs and urine stasis. In mares, periodic opening and closing of the vulva occurs as well. Urinary irritation may contribute to the appearance that mares are in estrus. Horses develop posterior ataxia and incoordination after grazing for several days on rapidly growing Sorghum forages. Forced exercise may cause affected horses to stumble or drop the ground momentarily.
From wikipedia: Some species of sorghum can contain levels of hydrogen cyanide, hordenine and nitrates lethal to grazing animals in the early stages of the plant's growth. Stressed plants, even at later stages of growth, can also contain toxic levels of cyanide.
Also from Wkipedia:
In India, and other places, Sweet Sorghum stalks are used for producing bio-fuel by squeezing the juice and then fermenting into ethanol. Texas A&M University in the United States is currently running trials to produce the best varieties for ethanol production from sorghum leaves and stalks in the USA.
So you have the answer to your question:
So please tell me what low-cost, non-food feedstocks are readily available?
I can continue but I think I gave you the tools to research more.
If you need anything else answered, I am willing to help
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