Nature, especially in our time, is so integrated into the dynamics of society and culture that by now it hardly constitutes an independent variable. Desertification and the decline in productivity in some agricultural areas are also the result of impoverishment and underdevelopment among their inhabitants. When incentives are offered for their economic and cultural development, nature itself is protected. Moreover, how many natural resources are squandered by wars! Peace in and among peoples would also provide greater protection for nature. The hoarding of resources, especially water, can generate serious conflicts among the peoples involved. Peaceful agreement about the use of resources can protect nature and, at the same time, the well-being of the societies concerned.
The Church has a responsibility towards creation and she must assert this responsibility in the public sphere. In so doing, she must defend not only earth, water and air as gifts of creation that belong to everyone. She must above all protect mankind from self-destruction. There is need for what might be called a human ecology, correctly understood. The deterioration of nature is in fact closely connected to the culture that shapes human coexistence: when “human ecology” is respected within society, environmental ecology also benefits. Just as human virtues are interrelated, such that the weakening of one places others at risk, so the ecological system is based on respect for a plan that affects both the health of society and its good relationship with nature.
52. Truth, and the love which it reveals, cannot be produced: they can only be received as a gift. Their ultimate source is not, and cannot be, mankind, but only God, who is himself Truth and Love. This principle is extremely important for society and for development, since neither can be a purely human product; the vocation to development on the part of individuals and peoples is not based simply on human choice, but is an intrinsic part of a plan that is prior to us and constitutes for all of us a duty to be freely accepted. That which is prior to us and constitutes us — subsistent Love and Truth — shows us what goodness is, and in what our true happiness consists. It shows us the road to true development.