Since Pope Francis and the encyclical Laudato Sì', the Church has developed a new way of speaking about climate. Now, however, the Vatican is taking a further step: absorbing the issue into doctrine itself, through the concept of 'sin' — a fundamental development that could have an enormous impact, because it acts on human morality. On 21 August, the International Theological Commission (ITC) — made up of bishops from around the world who study emerging doctrinal issues in the Church and in contemporary society — published Caring for Our Common Home: A Responsible and Fraternal Response to the Triune God, a document that, for the first time so explicitly in an official theological text, defines the exploitation of nature as "sin against creation and the Creator".

But what does this mean in practice? It is not a new category of canon law, nor a list of behaviours to confess. It is a deeper operation: the Commission — which describes it as "a bold diagnosis" — shifts environmental exploitation from the realm of technical error or mismanagement into that of moral and spiritual guilt. Polluting, destroying ecosystems, and exploiting resources without limit is no longer (merely) a policy problem: for Catholic theology, it is a rupture in the relationship between humanity and God, on a par with other forms of sin recognised by tradition.

Creation bent to human needs

The document was conceived precisely as a development of Pope Francis's Laudato si', and from this theological premise it draws the appeal that runs throughout the text: an ecological conversion understood no longer as a symbolic gesture, but as a radical change in the way we inhabit the planet. An urgency, the theologians write, dictated by the fact that humanity is approaching a point of no return. In recent centuries, the text explains,

Three great mutations — not simultaneous — within culture have significantly altered the perception of nature and, with it, our relationship to it. First, the spontaneity with which nature was regarded as created by God has changed. Second, the conception of the human being's place in the cosmos has changed, with the presumption that he or his technological products occupy the axial centre of the world, eliminating both God and the cosmos from their rightful place. As the final episode of this "anthropocentric and predatory" vision of our relationship with nature, we have, thirdly, fallen into a planetary ecological and social crisis. The qualitative leap in our relationship with the natural world, brought about by modern technology — along with many advances that greatly improve our living conditions — has indeed been accompanied by a global impact on the environment, previously unknown, denounced in pioneering fashion by the scientific community itself.

Scientific data and Pope Francis's appeals

Data are marshalled to support the diagnosis. The document cites the UN's sixth environmental report, according to which the overall state of the planet has continued to deteriorate despite government policies: declining biodiversity, worsening freshwater quality since 1990, air pollution, and zoonoses accounting for more than 60 per cent of infectious diseases transmitted to humans.

"Pope Francis (Laudato si', Querida Amazonia, Laudate Deum), in continuity with his predecessors, has never ceased to draw on the findings of scientific studies in order to launch, on the basis of them, an urgent appeal for an integral ecological conversion, formulated in various ways. Throughout history, human beings, in their interaction with the surrounding natural world, have in different eras and regions practised a harmonious coexistence with nature — especially in cultures with more limited technological capacities and a stronger sense of kinship with the environment. But they have also interacted with the environment through predatory and destructive actions, thereby failing to honour the divine mandate to care for our Common Home."

On the level of principles, the Commission seeks to avoid two extremes: on one side, the indiscriminate exploitation of nature; on the other, visions that erase any distinction between humanity and the rest of creation. The proposed synthesis is that of a human being as "steward and servant" of the planet, not its master. Among the biblical models invoked, the document cites the "sabbatical principle" — the periodic rest for people, animals and land prescribed by Jewish tradition — as a concrete alternative to the logic of limitless productivity.

Sin against Creation

The text closes with a series of criteria for translating ecological conversion into practice: heeding the "cry of the Earth and of the poor", the universal destination of goods, preferential attention to the most vulnerable, and an invitation to dialogue with other religious traditions on the care of the planet. It culminates in the concept of sin, tied to the rupture of three relationships that, for the Church, have defined the human being since Genesis: the relationship with God, with others, and with creation. For the Commission, harming the planet is not an isolated act that concerns only the environment: it is the same dynamic of estrangement from God that the Christian tradition associates with original sin, applied this time to our relationship with nature. This is why the document speaks of "sin against creation" and "sin against the Creator" almost as synonyms: to wound the one, within the trinitarian theology the text develops, inevitably means to wound the other.

Today it is clear that we urgently need an ecological turning point that will reposition us, helping us to understand more deeply our embeddedness in and dependence on the environment. This awareness implies the recognition of divine sovereignty, the goodness of creation, and the singular place of the human being in the cosmos as God's own interlocutor and representative. It also entails the recognition of the structures of sin against creation and the Creator, and the imperative of a conversion towards an integral ecology.