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E-M:/ Offset population impacts and go vegan

Why it makes good  sense to be vegan, if you treasure our environment:
-It takes on average, 28 calories of fossil fuel energy to produce 1 calorie of meat protein for human consumption, {whereas} it takes only 3.3 calories of fossil fuel energy to produce 1 calorie of proten from grain for human consumption.
~David Pimentel, Cornell University
-The standard diet of a person in the United States requires 4,200 qllons of water per day {for animals drinking water, irrigation of crops, processing, washing, cooking, etc}  A person on a vegan diet requires only 300 gallons a day.
~Richard H. Schwartz in Judaism and Vegetarianism
-A report from the International Water Management Institue , noting that 840 million of the world's people remain undernourished, recommends finding ways to produce more food using less water.  The report notes that it takes 550 liters of water to produce enough flour for one loaf of bread in developing countries...but up to 7,000 liters of wter to produce 100 grams of beef.
~UN commission on Sustainable Development, "Water-More Nutrition Per Drop" 2004
-In 1900 just over 10% of the total grain grown worldwide was fed to animals; by 1950 this figure had risen to over 20%; by the late 1990s it stood at around 45%. Over 70% of US grain is fed to livestock.
~Prof. V. Smil, 'Rationalizing Animal Food Production,' in Feeding the World: A Challenge for the 21st Century, MIT Press, London, 2000.
Today, livestock consume over 70% of the grain produced in the U.S
~USDA, Economic Research, World Agricultural Supply and Demand Estimates, WASDE-256, (Washington DC: USDA, July 11, 1990), tables 256-6, -7, -16, -19, -23.
-A report commissioned by the United Nations Food and Agriculture Organisation (FAO), the US Agency for International Development (USAID) and the World Bank concluded that factory farming, "acts directly on land, water, air and biodiversity through the emission of animal waste, use of fossil fuels and substitution of animal genetic resources. In addition, it affects the global land base indirectly through its effect on the arable land needed to satisfy its feed concentrate requirements. Ammonia emissions from manure storage and application lead to localized acid rain and ailing forests."
~C. de Haan, H. Steinfeld & H. Blackburn, 'Livestock and the Environment: Finding a Balance' FAO, USAID, World Bank, 1998
-Nutrients in animal waste cause algal blooms, which use up oxygen in the water, contributing to a "dead zone" in the Gulf Of Mexico where there's not enough oxygen to support aquatic life.  The dead zone stretched over 7,700 square miles during the summer of 1999.
~National Resources Defense Council
-One ton of methane, the chief agricultural greenhouse gas , has the global warming potential of 23 tons of carbon dioxide.  A dairy cow produces about 75 kilograms of methane a year, equivalent to over 1.5 {metric}tons of carbon dioxide.  The cow is doing what comes naturally, but people are included to forget that farming is an industry.  We cleared the land, sowed the pasture, bred the stock, and so on.  We're pretty good at it, which is why atmospheric concentrations of methane increased by 150 percent over the past 250 years, while carbon dioxice concentrations increased by 30 percent.
~Pete Hodgson, New Zealand Minister for Energy, Science and Fisheries
-It takes the equivalent of a gallon of gasoline to produce a pound of grain-fed beef in the U.S. {Jeremy Rifkin, Beyond Beef: The Rise and Fall of the Cattle Culture. p. 225.} Some of the energy was used in the feedlot, or in transportation and cold storage, but most of it went to fertilizing the feed grain used to grow the modern steer or cow. In order to reach its slaughter weight in 15 months, the industrial cow can’t go nibbling grass. It needs growth hormones, antibiotics; and high-fat corn, which is increasingly genetically engineered, and uses more oil in its production than any other industrial crop. To provide the yearly average beef consumption of an American family of four requires over 260 gallons of fossil fuel.{Jeremy Rifkin, Beyond Beef: The Rise and Fall of the Cattle Culture. p. 225. }
-Currently, in the U.S., 157 million metric tons of cereal, legumes, and vegetable protein suitable for human use is fed to livestock every year to produce only 28 million metric tons of animal protein consumed by humans
~David Pimentel et al.; “Energy and Land Constraints in Food Protein Production,” Science, 190, 1975.
-“Let’s say you take a shower every day…and your showers average seven minutes… and the flow rate through your shower head is 2 gallons per minute… You would use, at that rate, [5,110] gallons of water to shower every day for a year. When you compare that figure, [5,110] gallons of water, to the amount the Water Education Foundation calculates is used in the production of every pound of California beef (2,464 gallons),you realize something extraordinary. In California today, you may save more water by not eating a pound of beef than you would by not showering for six entire months. 
~ John Robbins, How Your Diet Can Help Save Your Life and the World
“Nothing will benefit human health and increase chances of survival of life on Earth as much as the evolution to a vegetarian diet.”
~Albert Einstein