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Unformatted text preview: Land Use Plant foods provide about 10x as much protein per acre as mean Broccoli produces 5x as much calcium per acre as milk and 24x as much iron Oats yield 6x as many calories per acre as pork, and 25x more as beef Water Use Issues The amount of water needed to produce a pound of meat if 50x that needed to produce wheat Underground pools of water are drying up. Animal production is the major cause of falling water tables and drying wells across cattle country. Food as Fuel Biofuels- use carbon stored in plants as fuel Turn grain into alcohol • Grind corn, or other grain, mix with water and heat • Added enzymes convert starch into sugars • Yeast turns sugars into alcohol and alcohol is separated from water by distillation • Alcohol used as fuel; distillers’ grains fed to cows; nitrogen-rich wastewater used as fertilizer...
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- Fall '13
- Energy, Carbohydrate, Raw material extraction, Embodied Energy