"The sphere of altruism has broadened from the family and tribe to nation, race, and now to all human beings. The process should be extended to include all beings with interests, of whatever species. But we cannot simply propose this as the ultimate ethical standard and expect everyone to act accordingly. We must begin to design our culture so that it encourages broader concerns without frustrating relatively permanent human desires"
Animal Rights FAQ
The End of Suffering?
The Post-Darwinian Transition
Reasons to be Vegetarian (video)