In 1975, Peter Singer wrote one of the most influential books of the last 30 years. It was called Animal Liberation. Since then he has gone on to become one of the world's foremost authorities on both Animal Rights and Ethics. Of late, he's taken to writing about the ethics of globalisation, and of George W Bush. But now he's returning to the ground of his first book for The Ethics of What We Eat, a book which journeys from the dining tables of three families to the origins of their food.

It's a sprawling, all encompassing, sometimes shocking but always carefully balanced look at the world of industrial factory farming, the emerging organic and fair trade movements. He and fellow author Jim Mason journey from crab boats in Chesapeake Bay to organic supermarkets in Melbourne, to uncover the ways in which our choices in what we eat can be as much an ethical and political act as anything else.

He is currently professor of bioethics at Princeton University.

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