I again recommend this podcast. It's Part II of a fascinating series by the BBC, Animals & Us. I linked to Part I a few posts ago. The BBC can do a better job of describing it than I can:
It was 28 years ago that the documentary maker Victor Schonfeld produced The Animals Film about the way humans exploit other species. He returns to the subject in a two-part documentary to give a very personal view on what, if anything, has changed since then.
In part two he focuses on the scientific establishment's attachment to using animals, and considers the future. Might social justice for other species actually benefit humans?