The first of two programmes on nuclear winter.
In 1983 Toon, Turco,
Ackerman, Pollack and Sagan alerted the world to the danger of nuclear winter: that nuclear war might kill more people by its effects on the climate than by blast and radiation. Colin Tudge teases out the details of their predictions and compares them with scientists who prefer to think of nuclear autumn. Producer NICHOLAS MORGAN Mono (R)