In the last 50 years (my lifetime) the population of the world has more than doubled from 3 billion to 6.5 billion, and by the time my children are around my age in 2040 the population will reach 9 billion or more. We cannot agree to feed 1 billion people now, and as oil-subsidised food declines and food prices rise, how will we take responsibility for another 3 billion people to feed? What do you think we can we do to limit population?