"The dissolution of commercial animal farming as we know it obviously requires more than our individual commitment to vegetarianism. To refuse on principle to buy products of the meat industry is to do what is right, but it is not to do enough. To recognize the rights of animals is to recognize the related duty to defend them against those who violate their rights, and to discharge this duty requires more than our individual abstention. It requires acting to bring about those changes that are necessary if the rights of these animals are not to be violated. Fundamentally, then, it requires a revolution in our culture's thought about, and its accepted treatment of, farm animals... But prejudices die hard, all the more so when they are insulated by widespread secular customs and religious beliefs, sustained by large and powerful economic interests, and protected by the common law. To overcome the collective entropy of those forces against change will not be easy. The animal rights movement is not for the faint heart."
Animal Rights FAQ
The End of Suffering?
The Post-Darwinian Transition
Reasons to be Vegetarian (video)