All vegetarians should read "The Vegetarian Myth" by Lierre Keith. Vegetarians are no more ecologically sound than omnivores. Entire ecosystems have been ruined by agriculture both to feed humans and animals. In our country these ecosystems were long gone before we were born, so we tend to be unaware of the disappearance of the tall grass prairies of the midwest, among others. As a previous commenter mentioned, rotational grazing of animals on lands too marginal for agriculture results in net carbon sequestration and building of topsoil.

The following quotes, facts, figures and statistics are excerpted from Please Don't Eat the Animals (2007) by Jennifer Horsman and Jaime Flowers:

"A reduction in beef and other meat consumption is the most potent single act you can take to halt the destruction of our environment and preserve our natural resources.  Our choices do matter:  What's healthiest for each of us personally is also healthiest for the life support system of our precious, but wounded planet."

---John Robbins, author, Diet for a New America, and President, EarthSave Foundation

One study puts animal waste in the United States to between 2.4 trillion to 3.9 trillion pounds per year.  The United states produces 15,000 pounds of manure per person.  This is 130 times the amount of waste produced by the entire human population of the United States. 

A 1,000-cow dairy can produce approximately 120,000 pounds of waste per day.  This is the functional equivalent of the amount of sanitary waste produced by a city of 20,000 people.

A 20,000-chicken factory produces about 2.4 million pounds of manure a year.  Poultry factories are one of the fastest growing industries throughout Asia.

One pig excretes nearly three gallons of waste per day, or 2.5 times the average human's daily total.  One hog farm with 50,000 pigs in France produces more waste than the entire city of Los Angeles, and some pig farms are much larger.

Factory farm pollution is the primary source of damage to coastal waters in North and South America, Europe, and Asia.  Scientists report that over sixty percent of the coastal waters in the United States are moderately to severely degraded from factory farm nutrient pollution.  This pollution creates oxygen-depleted dead zones, which are huge areas of ocean devoid of aquatic life.

Meat production causes deforestation, which then contributes to global warming.  Trees convert carbon dioxide into oxygen, and the destruction of forests around the globe to make room for grazing cattle furthers the greenhouse effect.  The Food and Agricultural Organization of the United Nations reports that the annual rate of tropical deforestation has increased from 9 million hectares in 1980 to 16.8 million hectares in 1990, and unfortunately, this destruction has accelerated since then.  By 1994, a staggering 200 million hectares of rainforest had been destroyed in South America just for cattle.

"The impact of countless hooves and mouths over the years has done more to alter the type of vegetation and land forms of the West than all the water projects, strip mines, power plants, freeways, and sub-division developments combined."

---Philip Fradkin, in Audubon, National Audubon Society, New York

Agricultural meat production generates air pollution.  As manure decomposes, it releases over 400 volatile organic compounds, many of which are extremely harmful to human health.  Nitrogen, a major by-product of animal wastes, changes to ammonia as it escapes into the air, and this is a major source of acid rain.  Worldwide, livestock produce over 30 million tons of ammonia.  Hydrogen sulfide, another chemical released from animal waste, can cause irreversible neurological damage, even at low levels.

The World Conservation Union lists over 1,000 different fish species that are threatened or endangered. According to the United Nations Food and Agriculture Organization (FAO) estimate, over 60 percent of the world's fish species are either fully exploited or depleted.  Commercial fish populations of cod, hake, haddock, and flounder have fallen by as much as 95 percent in the north Atlantic. 

The United States and Europe lose several billion tons of topsoil each year from cropland and grazing land, and 84 percent of this erosion is caused by livestock agriculture.  While this soil is theoretically a renewable resource, we are losing soil at a much faster rate than we are able to replace it.  It takes 100 to 500 years to produce one inch of topsoil, but due to livestock grazing and feeding, farming areas can lose up to six inches of topsoil a year.

Livestock production affects a startling 70 to 85 percent of the land area of the United States, United Kingdom, and the European Union.  That includes the public and private rangeland used for grazing, as well as the land used to produce the crops that feed the animals.  By comparison, urbanization only affects 3 percent of the United States land area, slightly larger for the European Union and the United Kingdom.  Meat production consumes the world's land resources.

Half of all fresh water worldwide is used for thirsty livestock.  Producing eight ounces of beef requires an unimaginable 25,000 liters of water, or the water necessary for one pound of steak equals the water consumption of the average household for a year.

The United States government spends $10 million each year to kill an estimated 100,000 wild animals, including coyotes, foxes, bobcats, badgers, bears, and mountain lions just to placate ranchers who don't want these animals killing their livestock.  The cost far outweighs the damage to livestock that these predators cause.

The Worldwatch Institute estimates one pound of steak from a steer raised in a feedlot costs:  five pounds of grain, a whopping 2,500 gallons of water, the energy equivalent of a gallon of gasoline, and about 34 pounds of topsoil.

33 percent of our nation's raw materials and fossil fuels go into livestock destined for slaughter.  In a vegan economy, only 2 percent of our resources will go to the production of food.

"It seems disingenuous for the intellectual elite of the first world to dwell on the subject of too many babies being born in the second- and third-world nations while virtually ignoring the overpopulation of cattle and the realities of a food chain that robs the poor of sustenance to feed the rich a steady diet of grain-fed meat."

---Jeremy Rifkin, author, Beyond Beef:  The Rise and Fall of the Cattle Culture, and president of the Greenhouse Crisis Foundation

Lester Brown of the Overseas Development Council calculates that if Americans reduced their meat consumption by only 10 percent per year, it would free at least 12 million tons of grain for human consumption--or enough to feed 60 million people.

Thanks, Katherine, for the links to the cited stories.  I’ve always loved reading footnotes and links like yours provide the full articles, studies, etc.  I read them and added 2 to my research files.

Lord Stern may be a famous economist but he's a lousy scientist. 

A good scientist would have checked more carefully the information that he has been given about the impact of animal agriculture on climate AND asked whether or not he had only been given part of the story, possibly to advance agendas having little or nothing to do with global climate change.

There's a lot more to global climate change than greenhouse gases.  A good example is the huge growth of deserts in Africa.  Like the decrease in the polar ice cap, this growing desertification is steadily affecting climate, too.  And it is hard to distinguish its effect from that of greenhouse gases.

Allan Savory's pioneering work in the holistic management of grasslands via Holistic Management International (http://www.holisticmanagement.org/) replicates grasslands' natural ecological requirement for grazing animals with domestic livestock.  The photos on the cited website truly are worth a thousand words.  They clearly demonstrate how quickly controlled use of grazing animals can reverse years of misuse and neglect.

I believe it was Wendell Berry who noted how humans took traditional agriculture's grand solution--bio-diverse farms raising both plants and animals--and divided it into 2 huge problems--cropland needing fertilizer and CAFOs with huge stocks of dangerous animal waste.

The result is both unnatural and unsustainable. 

Lord Stern, John Robbins, Jeremy Rifkin and Lester Brown fail to note that almost all of their statistics are connected to this industrial approach to raising animal protein.  They completely ignore the multi-species grazing systems developed by people like Joel Salatin at Polyface Farm (http://polyfacefarms.com/).  Joel Salatin describes himself as a grass farmer because nothing works at Polyface without grass grown the right way.  His land was not only green during the major drought of 2007 and 2008 but his pastures sequestered huge additional amounts of atmospheric carbon during that time.

Through the efforts of groups like the Carbon Coalition Against Global Warming of Australia (http://www.carboncoalition.com.au/) and scientists like Dr. Christine Jones (http://www.amazingcarbon.com/), it is clear that well designed, intensive grazing of grasslands by domesticated livestock offers the quickest and greatest opportunity to reduce atmospheric carbon.

For over 14 years my wife, Elaine, and I have been working to rebuild local agriculture for local people as growers, distributors and retailers of local food.  Locally produced and processed meat is a cornerstone of the healthy food movement. 

If anyone wants assistance in learning more of this amazing story, please contact me at hhamil@buncombe.main.nc.us.

"A diet that can lead to heart attacks, cancer, and numerous other diseases cannot be a natural diet," writes Keith Akers in A Vegetarian Sourcebook.  "A diet that pillages our resources of land, water, forests, and energy cannot be a natural diet.  A diet that causes the unnecessary suffering and death of billions of animals each year cannot be a natural diet."

I understand there are conservative Christians who fear vegetarianism...which is kind of like being afraid of nonsmoking, nondrinking, or recycling.  Ronald J. Sider of Evangelicals for Social Action, in his 1977 book, Rich Christians in an Age of Hunger, pointed out that 220 million Americans were eating enough food (largely because of the high consumption of grain fed to livestock) to feed over one billion people in the poorer countries.

A pamphlet put out by Compassion Over Killing says raising animals for food is one of the leading causes of both pollution and resource depletion today.  According to a recent United Nations report, "Livestock's Long Shadow," raising chickens, turkeys, pigs, and other animals for food causes more greenhouse gas emissions than all the cars, trucks and other forms of transportation combined.  Researchers from the University of Chicago similarly concluded that a vegetarian diet is the most energy efficient, and the average American does more to reduce global warming emissions by not eating animal products than by switching to a hybrid car.

A 2007 journal published by the American Dietetic Association found "meat protein production required 26 times more water than vegetable protein on rain-fed lands."  The journal further states that dieticians "can encourage eating that is both healthful and conserving of soil, water, and energy by emphasizing plant sources of protein and foods that have been produced with fewer agricultural inputs."

"Livestock are one of the most significant contributors to today's most serious environmental problems.  Urgent action is required to remedy the situation." 

---Union Nations' Food and Agriculture Association

A single dairy cow produces approximately 120 pounds of wet manure per day, which is equivalent to that of 20 to 40 humans.

70% of the grain grown and 50% of the water consumed in the U.S. are used by the meat industry.  (Audubon Society)

On average 990 liters of water are required to produce one liter of milk.  (United Nations)

Over 260 million acres of U.S. forest have been cleared to grow grain for livestock.  (Greenpeace)

It takes nearly one gallon of fossil fuel and 5,200 gallons of water to produce just one pound of conventionally fed beef.  (Mother Jones)

Farmed animals produce an estimated 1.4 billion tons of fecal waste each year in the U.S.  Much of this untreated waste pollutes the land and water.

The number of animals killed for food in the United States is 70 times larger than the number of animals killed in laboratories, 30 times larger than the number killed by hunters and trappers, and 500 times larger than the number of animals killed in animal pounds.

“If anyone wants to save the planet,” says Paul McCartney in a PETA interview, “all they have to do is stop eating meat. That’s the single most important thing you could do. It’s staggering when you think about it. Vegetarianism takes care of so many things in one shot: ecology, famine, cruelty. Let’s do it! Linda was right.  Going veggie is the single best idea for the new century.”

Why don't people who are so concerned about their carbon footprint simply do earth a favor and permanently remove themselves from its surface. Then their conscience will be clear.

I'm glad to see that this issue is gaining more attention, even if people are disagreeing with it! Hopefully change is on the way!