The "population bomb" is on the environmental agenda once more.
Green guru Jonathon Porritt recently lambasted the politically correct for ignoring the demographic elephant in the living room - "exponential population growth". Is he right?
When Paul Ehrlich wrote The Population Bomb in 1968, our rising numbers were seen as the primary threat to the planet's future. Only strict birth control could prevent doomsday. Some demographers said we should require a licence to have children, as you would for a dog.