Global warming has been called humankind's "greatest challenge" and the world's most grave environmental threat, and science shows that one of the most effective ways to fight global warming is to go vegetarian.¹

Stars such as Sir Paul McCartney and Chrissie Hynde are lending their voices to share what science has already proven—that the meat industry is one of the leading sources of the greenhouse gases that lead to global warming.

When asked what personal change people could make to help the environment, McCartney replied, "I think the biggest change anyone could make in their own lifestyle would be to become vegetarian." To read the complete interview with Sir Paul McCartney, visit PETA's blog The PETA Files.

A 2006 United Nations report found that the meat industry produces more greenhouse gases than all the SUVs, Hummers, cars, trucks, planes, and ships in the world combined.² Greenhouse gases cause global warming, which studies show will increasingly lead to catastrophic disasters—like droughts, floods, hurricanes, rising sea levels, and disease outbreaks—unless we drastically reduce the amounts emitted into the atmosphere.

Many conscientious people are trying to help reduce global warming by driving more fuel-efficient cars and using energy-saving light bulbs, but they could do more simply by going vegetarian.

• The official handbook for the Live Earth concerts says that "refusing meat" is the "single most effective thing you can do to reduce your carbon footprint."³
• According to Environmental Defense, if every American skipped one meal of chicken per week and substituted vegetarian foods instead, the carbon dioxide savings would be the same as taking more than a half-million cars off U.S. roads.
• The University of Chicago reports that going vegan is 50% more effective than switching to a hybrid car in reducing greenhouse gas emissions.

More than Just CO₂

Raising animals for their flesh, eggs, and milk is one of the world’s leading emitters of carbon dioxide (CO₂). But global warming is caused by more than just CO₂. Animal agriculture is the leading source of methane and nitrous oxide emissions, which—combined with carbon dioxide—causes the vast majority of global warming.

• Methane: The billions of farmed animals crammed into factory farms produce enormous amounts of methane, both during digestion and from the acres of cesspools filled with feces that they excrete. Methane is more than 20 times as powerful as carbon dioxide at trapping heat in our atmosphere.⁵ Statistics from the Environmental Protection Agency show that animal agriculture is the number one source of methane emissions in the U.S.⁶
• Nitrous Oxide: Nitrous oxide is about 300 times more potent as a global warming gas than carbon dioxide. According to the U.N., the meat, egg, and dairy industries account for a staggering 65 percent of worldwide nitrous oxide emissions.⁷

You Can Help Stop Global Warming Today

The most effective way to fight the global warming crisis is to stop eating meat, eggs, and dairy products. Start today by taking the Pledge To Be Veg for 30 Days. Please also take a few moments to encourage Al Gore, the most prominent voice in the fight against global warming, to add going vegetarian to his list of solutions to our climate crisis.

Read more about how you can help protect the environment.