The Ecological Cost of War

reflection by Cardinal Virgilio Pablo David

As the conflict in the Middle East escalates, the world’s attention naturally focuses on the horrific human cost — lives lost, families displaced, cities reduced to rubble. Every war is first and foremost a human tragedy.

But there is another dimension of war that we rarely speak about. The ecological cost.

Beyond the suffering of people, war also wounds the Earth itself. Forests burn. Rivers are polluted. Soil is poisoned. Wildlife habitats collapse. The land that sustains life becomes a battlefield—and long after the guns fall silent, the environmental damage often remains.

Research shows that the global military sector has an enormous climate footprint, responsible for roughly 5.5% of the world’s greenhouse-gas emissions—more than the combined emissions of civil aviation and shipping. If the world’s militaries were considered a single entity, they would rank among the largest emitters on the planet. Yet most military emissions remain largely invisible because nations are not required to report them in their climate commitments.

War also destroys ecosystems directly. Bombings ignite forests and wetlands—our planet’s natural carbon sinks. Toxic residues contaminate soil and groundwater. Oil depots burn. Cities collapse into mountains of debris. Even after the fighting ends, reconstruction releases massive amounts of carbon through the production of concrete, steel, and new infrastructure.

The environmental wounds of war can last for generations. We learned this from the moment the nuclear age began. Between 1945 and 1996, more than 500 atmospheric nuclear explosions scattered radioactive fallout across the planet—leaving contaminated soils, poisoned aquifers, and long-term health impacts that persist today. Scientists now warn that even a “limited” nuclear war could darken the skies with soot, disrupt global food systems, and trigger famine affecting billions.

War, in other words, is not only a humanitarian catastrophe. It is also ecological self-destruction.

We are seeing the environmental scars already in modern conflicts—from Ukraine to Gaza, from Syria to Sudan—where forests burn, farmland is ruined, rivers are contaminated, and cities become toxic rubble fields.

Scripture tells us that “all creation has been groaning in labor pains” (Romans 8:22). When human beings wage war against one another, we also wound the fragile web of life that sustains us.

Pope Francis has reminded us in Laudato Si’ that ecological conversion requires turning away from violence and domination toward care, reconciliation, and protection of our common home.

So as we watch the Middle East descend deeper into war, a difficult question arises:

While we count the human casualties, is anyone also counting the ecological cost?

Peace is not only a humanitarian necessity. It is also a climate imperative. To protect creation, we must learn again the ancient wisdom that the prophets never stopped proclaiming: there can be no justice, no human dignity, and no future for the Earth without peace.