Groups proposing policies of population control are once again making the headlines. They suggest that the world needs a smaller population to control its environmental footprint, to preserve natural resources and to ensure that we can live in peace and relative comfort. These ideas were once popular in the 1960s and 1970s. They are clearly incompatible with Catholic teaching on sex and the family. However, arguments in favour of an optimum population are also vacuous from an economic perspective. It is important that the economic arguments are understood. Particularly in Catholic schools, young people should not simply be taught the received wisdom on environmental issues: young Catholics should be encouraged to challenge the establishment view.
Todays environmentalists and population control enthusiasts are re-enacting a debate that took place a generation ago. In 1968 Paul Ehrlich, a biologist at Stanford University in California, was hailed as a prophet when he predicted in his book The Population Bomb that the number of human beings on Earth would soon outstrip the food available. Mass starvation would come not just to the Third World, but to America itself, which would see rationing and food riots and might be left with only 30 million people by the end of the century - about 10% of the actual figure in 2000. I would take even money that England will not exist in the year 2000, he opined on a television chat show in 1969. The solution, he said, lay in population control, policies such as the encouragement of sterilisation, contraception and abortion and, in extremis, the cutting off even of humanitarian aid to countries who refused to take such measures.
Time has not proven kind to Ehrlichs predictions of doom. In comparison with butterflies, Ehrlichs specialist field of study, humans have a much greater ability to use and create technology. As the green revolution, the propagation of better crop strains and improved irrigation techniques, allowed the people of India, China and other nations to feed their growing populations, experts have become increasingly sanguine about prospects for the world. Regular UN population conferences used to be held every ten years, but the last, which bore little fruit, was in 1994 in Cairo.
Nevertheless, last week, the Optimum Population Trust (OPT), of which Ehrlich is a patron along with the actress Susan Hampshire, argued in a submission to the All Party Parliamentary Group on Population, Development and Reproductive Health that immigrants coming to Britain did nothing for third-world development and damaged the global environment. In the process of becoming Western consumers, they argue, immigrants raise their ecological footprint, increase their environmental impact and accelerate global environmental damage. The OPTs views on immigration complement their views on population control more generally. They not only wish to control the number of people, but they also want to control where people live!
One reason for the OPTs pessimism is their belief in what is called the peak oil theory: the notion that the worlds energy is soon to run short, bringing about the collapse of industrial civilisation and leaving, an enormous surplus population. Another measure they use is a model called ecological footprinting. In their own words, this is a technique used to measure the ecologically sustainable bioproductivity of the planet and calculate by how much populations are overshooting sustainable levels of renewable resource consumption.
These issues are challenges, but they are relatively minor challenges to a developing world with a growing population.
Since the 1970s, economists have been adjusting standard economic statistics for the side-effects of economic growth, such as pollution.