As demand for meat has spread around the world, so, too, have the brutal industrial scale methods used to raise and slaughter animals for food, raising a host of pressing ethical and environmental questions. Improving animal welfare is no longer an issue of private, or even national, concern -- it is now a global imperative.
MIYUN PARK is Executive Director of Global Animal Partnership. PETER SINGER is Ira W. DeCamp Professor of Bioethics at Princeton University and Laureate Professor at the University of Melbourne. He is the author of Animal Liberation, among other books.

The Universal Declaration of Human Rights, adopted in 1948, articulates the idea that it is wrong to exclude any member of the human species from the circle of moral concern. This enlightened vision was a tremendous advance over earlier, more restricted views about who matters morally; yet it still excludes a far larger number of beings who can both enjoy life and suffer: nonhuman animals. They, or at least those capable of feeling pain, which at a minimum includes all vertebrates, are also entitled to concern. Pain is pain, irrespective of the species of the being that experiences it.
Concern for the welfare of animals is not a new idea. In the fourth century BC, the Chinese Taoist philosopher Zhuangzi said that compassion should permeate relations not only between humans but also between all sentient beings. Buddhist teachings consider caring for all sentient beings a central ethical precept. The Indian emperor Ashoka, who ruled in the third century BC, issued edicts against the unnecessary killing and mutilation of animals, including hunting for sport. He also established animal hospitals and promoted, but did not require, a vegetarian diet. In seventeenth-century Japan, Tokugawa Tsunayoshi, the so-called Dog Shogun, enacted various rules protecting animals, especially dogs. The Hebrew Bible requires that the Sabbath be a day of rest for oxen, as well as for humans, and other texts command Jews to relieve the suffering of animals, even if they belong to an enemy. The Koran, too, encourages Muslims to treat animals with kindness; the Prophet Muhammad is said to have cut off the sleeve of his shirt rather than disturb a cat who was sleeping on it...
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