Healing the Planet: Why Health Care Must Cut Its Carbon Footprint

Researchers warn that the global health sector, responsible for up to 5 percent of greenhouse gas emissions, must measure and reduce its environmental footprint to avoid worsening the climate crisis it is trying to manage. They call for climate, health and economic impacts to be evaluated together in clinical research and policy, with equity at the center of decision-making.

Hospitals are places of recovery and hope. But behind the life-saving equipment and sterile corridors lies a difficult truth: health care is a significant contributor to climate change. Researchers from the University of California, San Francisco; the Infectious Diseases Institute in Kampala; INSERM in Montpellier; and the Centre for Public Health at Queen's University Belfast say the sector can no longer ignore its environmental impact.

Health care is responsible for roughly 4 to 5 percent of global greenhouse gas emissions. Hospitals run around the clock, relying on energy-intensive equipment, temperature-controlled supply chains and large volumes of medical products. Pharmaceutical manufacturing, transport and medical waste disposal all add to the carbon footprint. The result is a troubling paradox. Health systems are treating patients harmed by heat waves, floods and wildfires, while at the same time contributing to the emissions driving those disasters.

Climate Change Is a Health Crisis

Climate change is not just an environmental issue. It is already affecting human health. Rising temperatures worsen respiratory and heart conditions. Extreme weather events lead to injuries, displacement and outbreaks of infectious diseases. Food and water shortages increase malnutrition and illness.

The health sector is on the front line of these impacts. Yet its own emissions accelerate land degradation, biodiversity loss, and air pollution. These environmental changes reduce food security, contaminate water sources and weaken ecosystems that people depend on. In the end, the damage circles back to human health, especially in vulnerable communities.

Inequality at the Heart of the Problem

The burden of responsibility is uneven. Industrialized countries generate the majority of global emissions, including those linked to medical research and development. Wealthier populations consume more medical technologies and treatments. Meanwhile, low-resource communities, which contribute least to climate change, often suffer the most from its consequences.

Africa highlights this imbalance. The continent is one of the most biodiverse regions in the world, yet it faces severe environmental threats. Researchers argue that African policy-makers and local communities must be central to decisions about how health-related emissions are measured and reduced. Solutions need to reflect local realities, not impose new burdens on already fragile health systems.

Rethinking Clinical Trials

Clinical trials are the gold standard for testing new treatments. They measure safety, effectiveness and often cost. But they rarely measure environmental impact. That gap may be costing more than we realize.

Medical products require raw materials, manufacturing, packaging and transport. All of this produces emissions. In one example from infection control research, switching to single-use disposable laryngoscopes increased waste and emissions without improving patient safety. The case shows why environmental impact must be measured, not assumed.

To address this, researchers are running innovative trials in Uganda and Zambia. In Uganda, they are comparing the carbon footprint of delivering HIV treatment to island communities by medical drones versus boats. In Zambia, they are assessing the environmental impact of a postnatal HIV prevention package compared with standard care. These studies measure carbon emissions alongside health outcomes and financial costs, using internationally recognized life cycle assessment methods. The aim is to see the full picture before scaling up interventions.

A New Way Forward for Global Health

The researchers propose a simple but powerful idea: link health, economic and climate outcomes in one decision-making framework. Health outcomes affect costs. Economic conditions influence vulnerability to climate risks. Climate events affect both people and health systems. None of these areas can be considered in isolation.

They also warn against “burden shifting,” where climate-friendly measures increase costs for poorer communities, or cost-saving strategies increase emissions. Trade-offs are sometimes unavoidable, but they should be transparent. Patient safety and quality of care must always come first. At the same time, equity should guide every decision.

The message is ultimately hopeful. By reducing waste, improving energy efficiency and redesigning supply chains, health systems can cut emissions and strengthen services at the same time. Measuring environmental impact in research and policy is the first step.

As climate pressures grow, the health sector faces a defining choice. It can continue responding to climate-related illness without examining its own role in the crisis. Or it can lead by example, reducing its carbon footprint while protecting both people and the planet. For a sector dedicated to saving lives, the path forward is clear.