A series of seven programmes
At the end of the 18th century, The Rev Thomas Malthus published his essay on population in which he said: 'Population has a tendency to increase beyond the means of subsistence'. His view was that when this happened, nature took a hand and there was a correction - famine for example, pestilence or war. In Europe, scientific advance and colonisation have, so far at least, postponed Malthus's gloomy prediction. But on a global scale, could Malthus yet be right?
John Seymour reports from around the world.
John Ormond narrates.
BBC Wales