From Pope Benedict XVI’s encyclical Caritas in Veritate (2009):
The notion of rights and duties in development must also take account of the problems associated with population growth. This is a very important aspect of authentic development, since it concerns the inalienable values of life and the family.110 To consider population increase as the primary cause of underdevelopment is mistaken, even from an economic point of view. Suffice it to consider, on the one hand, the significant reduction in infant mortality and the rise in average life expectancy found in economically developed countries, and on the other hand, the signs of crisis observable in societies that are registering an alarming decline in their birth rate. Due attention must obviously be given to responsible procreation, which among other things has a positive contribution to make to integral human development. The Church, in her concern for man’s authentic development, urges him to have full respect for human values in the exercise of his sexuality. It cannot be reduced merely to pleasure or entertainment, nor can sex education be reduced to technical instruction aimed solely at protecting the interested parties from possible disease or the “risk” of procreation. This would be to impoverish and disregard the deeper meaning of sexuality, a meaning which needs to be acknowledged and responsibly appropriated not only by individuals but also by the community. It is irresponsible to view sexuality merely as a source of pleasure, and likewise to regulate it through strategies of mandatory birth control. In either case materialistic ideas and policies are at work, and individuals are ultimately subjected to various forms of violence. Against such policies, there is a need to defend the primary competence of the family in the area of sexuality,111 as opposed to the State and its restrictive policies, and to ensure that parents are suitably prepared to undertake their responsibilities.
Morally responsible openness to life represents a rich social and economic resource. Populous nations have been able to emerge from poverty thanks not least to the size of their population and the talents of their people. On the other hand, formerly prosperous nations are presently passing through a phase of uncertainty and in some cases decline, precisely because of their falling birth rates; this has become a crucial problem for highly affluent societies. The decline in births, falling at times beneath the so-called “replacement level”, also puts a strain on social welfare systems, increases their cost, eats into savings and hence the financial resources needed for investment, reduces the availability of qualified labourers, and narrows the “brain pool” upon which nations can draw for their needs. Furthermore, smaller and at times miniscule families run the risk of impoverishing social relations, and failing to ensure effective forms of solidarity. These situations are symptomatic of scant confidence in the future and moral weariness. It is thus becoming a social and even economic necessity once more to hold up to future generations the beauty of marriage and the family, and the fact that these institutions correspond to the deepest needs and dignity of the person. In view of this, States are called to enact policies promoting the centrality and the integrity of the family founded on marriage between a man and a woman, the primary vital cell of society,112 and to assume responsibility for its economic and fiscal needs, while respecting its essentially relational character.
110 John Paul II, Encyclical Letter Laborem Exercens, 24: Acta Apostolicæ Sedis [AAS] 73 (1981), 637-638.
111 Ibid., 15: loc. cit., 616-618.
112 Encyclical Letter Populorum Progressio, 27: AAS 59 (1967), 271.
— Caritas in Veritate 44