Energy Balance: Water-Demand makes Renewables Unsustainable.
It takes resources to get resources, especially those of water, one that is often overlooked in the various strategies of obtaining renewable energy. It is reckoned to take 2,500 gallons of water to grow sufficient corn to make one gallon of ethanol, against which the often quoted, but still sizeable, four gallons of water required to produce a gallon of ethanol from corn (or other source of sugar) is a mere drop in the ocean. Indeed, the intention to produce 36 billion gallons of ethanol per year by 2022, would use enough water to keep Chicago supplied for over 100 years. In Illinois, fields are adequately watered by rainfall whereas in more westerly and dryer regions it is necessary for farmers to actively irrigate their fields.
written by
misspersian
1360 days ago
