Fifty years ago, Princeton University ethicist Peter Singer made the case that humans assume they're morally superior to other animals and that their actions against them are justified.

At the time, speciesism was a radical concept that was adopted by some animal rights groups but was largely ignored by the general public.

Today, roughly 10 to 15 percent of Americans identify as vegan or vegetarian according to researchers at Oklahoma State and Kansas State University.

But Singer argues there's still much more progress that needs to be made on animal rights.

His new book "Animal Liberation Now" revisits the themes of his 1975 seminal classic, Animal Liberation, and examines how the animal rights movement intersects with climate change, social justice, and more.

We discuss his latest book and the animal rights movement.

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