Pope Leo XIV’s Climate Offensive: A Green Gospel without Conversion?

Castel Gandolfo, October 1, 2025 — At the Raising Hope climate conference, Pope Leo XIV denounced those who “deride the increasingly evident signs of climate change” and “ridicule those who speak of global warming.”¹ Framed in stark moral language, the Pope warned that God will demand of each soul whether it has “cultivated and cared for the world he created.”² His remarks were cast as a continuation of Francis’s Laudato Si’ and contrasted by commentators with President Trump’s recent claim that climate change is “the greatest con job ever perpetrated on the world.”³

Continuity with Laudato Si’
Marking the tenth anniversary of Francis’s encyclical, Leo XIV repeated its call for ecological responsibility and urged citizens to put pressure on political leaders, declaring that “only then will it be possible to mitigate the damage done to the environment.”⁴ Yet this insistence reflects the same trajectory of elevating ecological themes into a quasi-doctrinal status, while allowing clarity on the supernatural end of man to recede. The prophetic voice of the Church risks being reduced to the register of secular environmental discourse.

Climate cycles and the question of causation
It is a fact long known to science that the Earth’s climate changes cyclically. Ice core records reveal recurring glacial and interglacial periods tied to orbital variations on timescales of tens of thousands of years.⁵ These natural rhythms have produced dramatic shifts without any human intervention. Critics therefore argue that present changes may represent another cycle, with mankind’s contribution negligible by comparison. There is truth in recalling that climate is not static, and that environmental alarmism often disregards the vast natural forces that have shaped the planet since creation.⁶

Scientific consensus and its limits
Mainstream scientific bodies, however, maintain that the pace of warming since the industrial revolution does not correspond to known orbital cycles. Studies emphasise “fingerprints” of human influence, including stratospheric cooling, isotopic signatures of carbon, and rapid tropospheric warming.⁷ The Intergovernmental Panel on Climate Change (IPCC) concludes that human greenhouse gas emissions are “the only plausible explanation for the observed global-scale warming since the mid-20th century.”⁸ Yet the very language of consensus can mask uncertainties: climatology is not a closed dogma, but an evolving science. Natural variability, solar activity, and feedback loops remain imperfectly understood, and sceptical voices insist the degree of human causation is often overstated.⁹

Theological framing: stewardship or substitution?
Authentic Catholic teaching affirms man’s duty of stewardship. Genesis entrusts Adam with the care of creation, and the Fathers denounced sinful exploitation.¹⁰ But the disorder afflicting nature stems from original sin and can only be healed through Christ.¹¹ By failing to frame ecological concerns within this supernatural horizon, Leo XIV risks reducing the Gospel to a programme of naturalistic activism. Lobbying politicians and installing solar panels are proposed as if they were the fulfilment of Christian duty, while sins against God and the sanctity of life are left in silence.

The politics of climate and the silence on sin
By aligning his rhetoric with the language of the climate lobby, and implicitly rebuking political leaders, the Pope appears to conflate the universal mission of the papacy with partisan agendas. More troubling is the omission: in a world beset by abortion, euthanasia, apostasy, and moral collapse, Leo XIV’s first great rebuke is directed not at sin but at climate scepticism. The faithful are left to ask whether the hierarchy of truths has been inverted, with carbon emissions treated as more urgent than the killing of innocents.¹²

A new seamless garment
The speech reflects a broader tendency to place ecological concerns within the so-called “seamless garment” of moral issues, where life and death questions are relativised by association with political topics such as immigration, capital punishment, or renewable energy.¹³ Cardinal Ratzinger long warned that such flattening of moral truth obscures the proper hierarchy of goods.¹⁴ The result is confusion: recycling appears to bear the same moral weight as defending the unborn. The Church, rather than calling nations to repentance and penance, risks being reduced to an NGO for sustainability.

Conclusion: a false priority
Brazilian officials praised the Pope as an indispensable ally for the upcoming COP30, while Arnold Schwarzenegger lauded him as a “real world action hero.” Such applause from the world, however, has never been the test of fidelity. The mission of Peter is to confirm the brethren in the faith, not to baptise globalist agendas. Christian stewardship of creation is real, but it is not the heart of the Gospel. To elevate ecological activism above the call to conversion, penance, and the Kingship of Christ is to proclaim a false priority. The Church must return to pre-conciliar clarity, lest its voice dissolve into the empty chamber of climate politics.

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¹ BBC News, “Pope Leo condemns climate change critics,” October 1, 2025.
² Ibid.
³ UN General Assembly, President Donald Trump, Address, September 2025.
⁴ AP News, “Pope Leo criticises climate deniers,” October 2025.
⁵ J. Imbrie et al., “On the Structure and Origin of Major Glaciation Cycles,” Paleoceanography 7:6 (1992).
⁶ N. Scafetta, “Climate change and its causes: a discussion about some key issues,” La Chimica e l’Industria 1 (2010).
⁷ National Research Council, Attribution of Climate-Related Extreme Events (2016).
⁸ IPCC, Sixth Assessment Report, WG1, 2021, ch. 3.
⁹ R. Lindzen, “Climate Science: Is it currently designed to answer questions?” Euresis Journal 2 (2011).
¹⁰ Genesis 2:15; St John Chrysostom, Homilies on Genesis 13.
¹¹ St Augustine, City of God, XIII.23.
¹² Congregation for the Doctrine of the Faith, Donum Vitae (1987).
¹³ Joseph Bernardin, Address at Fordham University, December 6, 1983.
¹⁴ Joseph Ratzinger, The Ratzinger Report (1985).