Global Wildlife Population Halved in Fifty Years

A new report by the WWF blames humankind for the overuse of natural resources and unbridled consumption of some animal classes - which has led to a mass extinction. We explore the causes and extent of the damage.

Also in the programme - how technology affects our fine motor skills, and why India is building the world's highest railway.

(Photo: Deer forage for food in Glen Clunie. Credit: Getty Images)