From Wikipedia: Weaver had been a vegetarian since 1958 and student of yoga and meditation since the 1960s and a devoted follower of Paramahansa Yogananda, the Indian guru who established the Self Realization Fellowship in the United States. He was also renowned as an environmentalist, promoting eating lower on the food chain, alternate fuels such as hydrogen and wind power through an educational organization he founded, The Institute of Ecolonomics (a neologism formed by combining "ecology" and "economics"). He was also involved with John Denver's WindStar Foundation. He founded an organization called L.I.F.E. (Love is Feeding Everyone) which provided food for 150,000 needy people a week in Los Angeles.
"There will come a time … when civilized people will look back in horror on our generation and the ones that preceded it: the idea that we should eat other living things running around on four legs, that we should raise them just for the purpose of killing them! The people of the future will say “meat-eaters!” in disgust and regard us in the same way we regard cannibals and cannibalism" – Dennis Weaver