HOW MUCH IS TOO MUCH? The hidden health costs of climate change
- Lillian Engel
- 3 hours ago
- 7 min read
A flooded road does not look like a healthcare problem.
Neither does a washed-out culvert.
Or a stormwater project.
Or a city budget meeting.
But each one quietly shapes who gets sick, who gets care, who recovers, and who does not.
The environment, infrastructure, and public health are often treated as separate conversations. In practice, they move in tandem, reinforcing one another over time. What happens in the physical environment ultimately shows up in clinics, emergency rooms, and life expectancy data.
That is what makes climate change so difficult to measure. The impact cannot be limited to property damage. Rather, some of the greatest costs remain hidden in the health consequences that follow. The true cost is medical, social, and deeply unequal. The National Resources Defense Council estimates that the annual health costs of climate change and fossil-fuel pollution are more than $820 billion, a number that captures the burden of illness, premature death, and healthcare spending rather than only what gets destroyed in a storm.
In coastal communities like Wilmington, conversations surrounding climate change are often focused on what people can see: stronger storms, heavier rain, rising water, damaged homes, and flooded streets. Those impacts are immediate and visible. But there is another set of impacts that unfold more quietly, often after the water recedes.
The health bill.
It appears in emergency rooms after heat waves.
In asthma attacks driven by worsening air quality.
In contaminated drinking water after floods.
In mosquito-borne diseases, reaching new places.
In pregnancies made more dangerous by extreme heat.
In the anxiety, grief, and uncertainty that linger long after disasters end.
Different pathways. The same destination.
These are only some of the ways climate change seeps into nearly every system that shapes human health.
When recovery consumes public resources, less funding remains for flood-resilient infrastructure, environmental monitoring, disease surveillance, cooling centers, clean-water protections, or the public health programs that could reduce harm before the next event.
And as communities spend more on responding to disasters, they have fewer resources left to invest in prevention: the very thing that could reduce future harm, strengthen resilience, and break the cycle. Without that investment, each disaster leaves communities more vulnerable, making the next event more damaging and more costly than the last.
It becomes a cost spiral—one the United States is already paying for.
Extreme heat is one of the clearest examples of how environmental change becomes a health issue.
Anyone who has stepped outside on a Wilmington summer day knows the feeling: the air feels heavy, sweat does not seem to evaporate, and even a short walk outside can leave the body struggling to keep up. That is more than discomfort. In a place where heat and humidity often arrive together, the body has a much harder time cooling itself. When the air is already saturated with moisture, sweat evaporates less efficiently, increasing the risk of dehydration, heat exhaustion, heatstroke, cardiovascular strain, and other serious complications.
The danger is growing as climate change drives longer, hotter, and more frequent heat events. Already the deadliest weather-related hazard in the United States, extreme heat is becoming even more dangerous. A 2024 study published in JAMA found that between 1999 and 2023, annual heat-related deaths more than doubled—from 1,069 to 2,325, a 117% increase. Researchers caution that the true toll is likely even higher because heat often worsens existing cardiovascular and respiratory diseases without being listed as the primary cause of death. Extreme heat can increase cardiovascular stress by forcing the heart to work harder to circulate blood and regulate body temperature, worsen respiratory conditions by contributing to inflammation and poorer air quality, and place additional strain on individuals already managing chronic illnesses. In this way, heat exposure can exacerbate existing health challenges, leading to life-threatening complications.
As temperatures continue to rise, the burden on healthcare systems is expected to grow substantially. A recent study published in GeoHealth projected that heat-related illnesses resulting in emergency department visits or hospitalizations in the United States could increase from approximately 109,000 cases annually to as many as 237,000 cases by 2040 under a high-emissions scenario. Healthcare costs associated with those illnesses could exceed $1 billion annually, highlighting how rising temperatures affect not only individual health but the capacity of healthcare systems themselves.
Heat does not affect everyone equally. Older adults, outdoor workers, individuals with chronic illness, and those without access to air conditioning face significantly higher risks. Urban areas with less tree coverage and more heat-absorbing surfaces—often the same neighborhoods facing historical disinvestment—experience higher temperatures, a phenomenon known as the urban heat island effect.
For many Wilmington residents, extreme heat is no longer just another summer day. It shapes daily decisions: whether it's safe to work outside, whether children can play at the park, whether an older neighbor can make it through the afternoon without air conditioning. What was once just an uncomfortable part of coastal life is becoming a growing threat.
But rising temperatures do not only create heat exposure. They also reshape the air we breathe, the water we depend on, the food systems that sustain us, and the conditions that determine whether communities can remain healthy.
Climate change carries enormous costs. What remains is deciding when those costs are paid, and how they are borne by everyone.
Research consistently shows that preventing disasters through climate adaptation and preparedness is far less costly than responding after impacts occur. Investments in disaster resilience generate substantial economic returns; estimates from the National Institute of Building Sciences show that hazard mitigation investments can save approximately $6 for every $1 spent by reducing future disaster losses, while broader resilience investments have been estimated to provide up to $13 in benefits for every $1 invested, when accounting for avoided damages and wider economic impacts. These benefits extend far beyond financial savings, representing fewer injuries, reduced disruptions to essential services, improved community stability, and protection of public health as climate-related hazards become more frequent and severe.
Prevention relies on an extensive public health infrastructure that often goes unnoticed until it begins to disappear. Environmental monitoring tracks contaminants before they reach drinking water. Surveillance systems detect disease outbreaks before they spread. Public health agencies prepare hospitals, coordinate emergency response, and identify the communities most vulnerable to heat, flooding, poor air quality, and other climate-related hazards. These investments rarely make headlines because their greatest success is preventing crises from happening in the first place. But many of the institutions responsible for that work are now facing a very different reality.
That first line of defense is becoming increasingly fragile. Scientists, physicians, and public health leaders have raised concerns that reduced support for environmental monitoring, climate and health research, public health capacity, and regulatory oversight could leave communities with fewer tools to identify threats before they become emergencies.
Wilmington does not have to imagine what happens when prevention falls short.
The Cape Fear region has spent years living with the consequences of PFAS contamination. For many residents, after nearly 40 years of unknown exposure, GenX transformed drinking water into a source of uncertainty and underscored a difficult public health reality: once exposure occurs, there is no quick fix. Testing expands. Research continues. Families are left searching for answers while governments, utilities, healthcare systems, and taxpayers absorb the costs of monitoring, filtration, medical uncertainty, and long-term response.
That work is not over. PFAS contamination remains an ongoing challenge, and many scientists and environmental advocates have warned that recent federal rollbacks affecting environmental protections and PFAS regulation risk slowing progress at the very moment significantly stronger oversight is needed. For Wilmington, PFAS is not simply one environmental issue among many. It is a local reminder that prevention is almost always less costly and more effective than trying to undo harm after exposure has already occurred.
And these costs do not fall evenly.
The United States remains one of the wealthiest nations in the world, yet millions of people continue to struggle to secure stable housing, reliable transportation, nutritious food, and affordable healthcare. For families already deciding between groceries, rent, prescriptions, or recovering from the next storm, another climate-related burden is not simply an environmental issue.
It is a health burden.
It is a financial burden.
It is a burden that compounds existing inequities.
That reality brings the conversation back to Wilmington.
Those inequities are already reflected in the health of Wilmington’s communities. Earlier this year, Coastal Journalism Hub’s reporting on the 17-year life expectancy gap between the Woodberry Forest and Portia Hines Park neighborhoods showed how differences in neighborhood conditions translate into differences in life expectancy. The streets people walk, the homes they return to, the infrastructure protecting their neighborhoods, the environmental conditions surrounding them, and the resources available to their families all shape their ability to live healthy lives. Two people can live in the same city and experience very different health outcomes simply because their communities have been shaped by different levels of investment and opportunity.
Life expectancy is not a static measure of past inequity; it is also a warning about who may face the greatest harm as climate risks grow.
The question becomes: how much more can communities be asked to carry when many are already burdened by decades of unequal investment, limited resources, and fewer opportunities to recover?
Because climate change does not arrive in communities where everyone starts from the same place. It compounds the challenges faced by people who already have fewer resources, fewer protections, and fewer opportunities to recover.
That is why this story is not ultimately about storms, drainage systems, or infrastructure projects.
It is about people.
It is about exposure and vulnerability.
It is about which communities are protected, and which are left to face the consequences.
And it leads to a question that Wilmington, and many coastal communities, will increasingly face:
If where you live already influences how long you live, what happens when environmental risks intensify?
Because climate change does not send a single bill.
It sends many:
One to the city.
One to the healthcare system.
One to the homeowner.
One to the renter.
One to the worker who cannot afford to miss a shift.
One to the child whose health is shaped by the environment they never chose.
One to the neighborhood that has already been asked to carry more than its share.
The question is whether we choose to pay before the damage, or after it.
