A growing number of scientists are going where politicians fear to tread by calling for a wider public debate on the sensitive issue of the global human population, which is set to rise from the present 6.8 billion to perhaps 9 billion by 2050.
Lord Rees, the president of the Royal Society, brought the subject up in his excellent Reith Lectures; Sir David Attenborough has become a champion of those who believe population has been relegated as an environmental issue; and more recently Professor Aubrey Manning, presenter of the BBC's Earth Story, has stated that the sheer number of humans on the planet is the greatest menace the world faces...
