Former Archbishop of Canterbury Rowan Williams discusses his professional and theological journey and reflects on what he's learned along the way, from climate activism to inter-faith leadership.

Two of the most influential thinkers of our time, Peter Singer, Australian philosopher, Princeton professor and author of Animal Liberation, and the late Mary Midgley, described by the Guardian as "UK's foremost scourge of scientific pretention" go head to head on the future of bio-ethics. Roger...