The temperature is going up. Britain may become warmer, but even wetter. The grain belt of America may get too dry to produce grain. In India, the monsoons may fail. Humans around the globe would face greater challenges than ever.

By burning coal, oil and gas, carbon dioxide is added to the atmosphere. It keeps more of the sun's heat in, which is making the world warm up. And, in a chain reaction, sea level, crop growth and rainfall will all change. Can the Greenhouse Effect be avoided, caused as it is by one of the most basic human activities - the generation of power? As one scientist says: '...we're hooked, we can't stop'.

(Ceefax subtitles)