Many of the poor live in areas particularly affected by phenomena related to warming, and their means of subsistence are largely dependent on natural reserves and ecosystemic services such as agriculture, fishing and forestry. They have no other financial activities or resources which can enable them to adapt to climate change or to face natural disasters, and their access to social services and protection is very limited. For example, changes in climate, to which animals and plants cannot adapt, lead them to migrate; this in turn affects the livelihood of the poor, who are then forced to leave their homes, with great uncertainty for their future and that of their children. There has been a tragic rise in the number of migrants seeking to flee from the growing poverty caused by environmental degradation. . . . Our lack of response to these tragedies involving our brothers and sisters points to the loss of that sense of responsibility for our fellow men and women upon which all civil society is founded. (Pope Francis, On Care for Our Common Home [Laudato Si'], no. 25)

A link has often been noted between claims to a "right to excess", and even to transgression and vice, within affluent societies, and the lack of food, drinkable water, basic instruction and elementary health care in areas of the underdeveloped world and on the outskirts of large metropolitan centers. The link consists in this: individual rights, when detached from a framework of duties which grants them their full meaning, can run wild, leading to an escalation of demands which is effectively unlimited and indiscriminate. (Pope Benedict XVI, Charity in Truth, [Caritas in Veritate], no. 43)

The inviolability of the person which is a reflection of the absolute inviolability of God, finds its primary and fundamental expression in the inviolability of human life. Above all, the common outcry, which  is justly made on behalf of human rights-for example, the right to health, to  home, to work, to family, to culture- is false and illusory if the right to  life, the most basic and fundamental right and the condition for all other  personal rights, is not defended with maximum determination. (St. John Paul II, On the Vocation and Mission of the Lay Faithful [Christifideles Laici], no. 38) To be continued.