Having explained the science behind global warming, and addressed the arguments of the climate change sceptics earlier in the series, Dr Iain Stewart concludes the series by looking at the biggest challenge now facing climate scientists - Just how can they predict exactly what changes global warming will bring?
It's a journey that takes him from early attempts to model the climate system with dishpans, to supercomputers, and to the frontline of climate research today: Greenland. Most worryingly he discovers that scientists are becoming increasingly concerned that their models are actually underestimating the speed of changes already underway.

We are familiar with images of the hearings at the Nuremberg trials. But to this day, no one has taken us into the cells and minds of the accused. Leon Goldensohn, a 34-year-old American Jewish psychiatrist, spent six months visiting the 4 main Nazi war criminals.
Based on these unique and recently uncovered documents and reconstitutions of the main events, this film discloses for the first time the personal thoughts of the Nazis: Hermann Goering, Rudolf Hess, Hans Franck and Julius Streicher. These interviews raise serious questions concerning the psychic mechanisms and mysteries that set off acts of barbarity.