Science polymath and celebrated author, Jared Diamond has tackled some of the big questions about humanity: what is it that makes us uniquely human not just a third species of chimpanzee; and why do some societies thrive and others struggle to survive, or collapse?

Jim Al-Khalili talks to Jared Diamond about how his passion for the birds of Papua New Guinea overtook his medical interest in the gall bladder, and led him to undertake a scientific study of global history.

Once a Professor of Physiology, he became increasingly fascinated by the birds of Papua New Guinea.

Now Professor of Geography at University of California in LA, he stresses the vital importance of the environment in determining the success or otherwise of a society. He argues first that it was settled agriculture that enabled the white man to develop guns, germs and steel and later that abuse of the environment is often responsible for their collapse.