War reshapes the world across nearly every dimension of human life, from collapsing economies and displacing millions to disrupting food supplies, spreading disease, and leaving lasting psychological damage on entire generations. At the end of 2024, an estimated 123.2 million people worldwide were forcibly displaced due to conflict and violence, a figure that captures only one layer of war’s global footprint.
Economic Collapse in War Zones
The economic damage of war is staggering and often irreversible within a single generation. Syria’s GDP fell by 54% in the first eleven years of its civil war. Gaza has experienced an 81% decline in GDP. Israel’s economy contracted by at least 5.2% since its current conflict began. These aren’t abstract numbers. They represent businesses destroyed, savings wiped out, and entire workforces unable to earn a living.
The picture is sometimes more complicated for the aggressor. Russia’s GDP grew 3.6% in 2023 and 4% in 2024, largely driven by massive military spending. But estimates from late 2023 suggest the country has lost 30 to 35% of its GDP when accounting for sanctions, capital flight, and long-term structural damage. Military spending can inflate short-term growth figures while hollowing out an economy underneath.
These effects ripple outward. When a country’s economy collapses, its trading partners lose markets, supply chains break, and neighboring nations absorb millions of refugees who need housing, food, and work. The economic cost of war is never confined to the battlefield.
Food Prices Rise for Everyone
War disrupts global food supply in ways that reach grocery stores thousands of miles from any fighting. When Russia invaded Ukraine, two of the world’s largest grain exporters were suddenly locked in conflict. By June 2022, the global Agricultural Price Index was 34% higher than it had been in January 2021. Maize prices jumped 47%, wheat rose 42%, and the FAO Cereal Price Index climbed 17.9% over the course of that year.
The damage extends beyond grain. Fertilizer production depends heavily on natural gas, and energy price spikes from conflict drive up the cost of producing food everywhere. Edible oils and pesticides follow the same pattern. Countries in Africa and the Middle East that depend on imported wheat were hit especially hard, pushing millions closer to hunger who had no connection to the war itself. These price shocks compound problems that already existed before the conflict, including pandemic-related supply chain disruptions and adverse weather from climate change.
Displacement on a Massive Scale
The 123.2 million people forcibly displaced worldwide at the end of 2024 include 42.7 million refugees who crossed international borders and 73.5 million people displaced within their own countries. To put that in perspective, the displaced population is larger than the entire population of most countries.
Displacement doesn’t just move people. It strips them of homes, jobs, social networks, and access to healthcare and education. Refugee camps and informal settlements become long-term realities for millions, sometimes lasting decades. Host countries face enormous pressure on housing, infrastructure, and public services, which can fuel political tension and resentment toward the very people who had no choice but to flee.
Healthcare Systems Collapse
Hospitals and clinics are often among the first casualties of war, both from direct attacks and from the exodus of medical staff. In Tigray, Ethiopia, healthcare provision dropped to a minimum during the recent armed conflict, leaving large segments of the population with no access to medical care at all. This pattern repeats in nearly every modern conflict zone.
The collapse of healthcare infrastructure has consequences that extend far beyond treating war injuries. Vaccination programs fall apart, and diseases that were under control come roaring back. Conflict zones see significant increases in tuberculosis, cholera, viral hepatitis, and whooping cough. In 2023, whooping cough cases surged in multiple conflict-affected areas specifically because vaccination efforts had been disrupted. Chronic conditions like diabetes and heart disease go unmanaged. Pregnant women lose access to prenatal care. The health toll of war is driven as much by what stops working as by what explodes.
Mental Health Across Generations
Living through war leaves deep psychological scars on civilian populations. PTSD rates in conflict-affected countries dwarf those found in peacetime societies. Surveys have found PTSD rates of 37.4% in Algeria, 28.4% in Cambodia, 17.8% in Gaza, and 15.8% in Ethiopia. For comparison, the baseline rate in the United States is around 8%.
Among Bosnian refugees who experienced an average of more than six traumatic events, roughly one-third developed depression and one-quarter developed PTSD. Twenty percent met the criteria for both disorders simultaneously. Refugees who were tortured show even higher rates of psychiatric problems.
These mental health effects don’t stay contained to the generation that lived through the fighting. Parents with untreated PTSD and depression struggle to provide stable environments for their children. Trauma affects parenting, family cohesion, and community functioning in ways that can shape outcomes for decades after the last bullet is fired.
Children Lose Years of Education
War pulls children out of school at alarming rates. In Ethiopia’s Tigray region, enrollment dropped from 84.7% before armed violence to 75.5% in the following school year, a decline of 9.2 percentage points. Roughly one-quarter of the expected student population, about 9,000 children, simply stopped attending. The drop was nearly equal between boys and girls.
Lost education compounds over time. Children who miss even one or two years of schooling are far less likely to return, and those who do return often fall behind permanently. Multiply this across millions of children in conflict zones worldwide, and the result is a generation with fewer skills, fewer economic opportunities, and less capacity to rebuild their own societies. The educational damage of war is one of its most powerful mechanisms for keeping affected countries poor long after peace agreements are signed.
Environmental Damage and Carbon Emissions
Military activity is a significant source of greenhouse gas emissions. Global militaries contribute an estimated 5.5% of all greenhouse gas emissions worldwide, with the majority coming from supply chains and procurement rather than active combat operations. That figure includes manufacturing weapons, transporting equipment, maintaining bases, and fueling vehicles and aircraft during peacetime. During active conflict, the numbers spike.
Beyond carbon, war poisons landscapes directly. Bombed industrial sites leak chemicals into soil and water. Depleted uranium munitions contaminate land for decades. Forests are burned or cleared for military purposes. Oil infrastructure is targeted, causing massive spills. In many post-conflict countries, environmental contamination remains a health hazard long after fighting ends, contributing to cancer clusters and birth defects in communities living near former battlefields.
How These Effects Connect
None of these impacts exist in isolation. Economic collapse makes it impossible to rebuild hospitals, which worsens disease outbreaks, which deepens poverty. Displacement pulls children from schools, reducing the future workforce, which slows economic recovery. Food price shocks hit displaced populations hardest because they’ve already lost their income and savings. Mental health problems reduce people’s ability to work and parent, extending the damage into the next generation.
This interconnection is what makes war so destructive at a global level. A conflict between two countries doesn’t stay between two countries. It raises food prices in Egypt, fuels political instability in neighboring states, increases carbon emissions, and creates refugee populations that reshape demographics across entire continents. The 123.2 million displaced people at the end of 2024 are living proof that war’s effects respect no borders.