On February 12th, the Trump administration initiated a significant rollback of the nation’s climate policies by moving to rescind the 2009 endangerment finding, a formal determination by the Environmental Protection Agency (EPA) that six greenhouse gases driving climate change, including carbon dioxide and methane from fossil fuel combustion, pose a threat to public health and welfare. This action, however, is being met with strong opposition from medical professionals, epidemiologists, and environmental health scientists who argue that the administration’s dismissal of these health risks is not only factually inaccurate but also profoundly dangerous for Americans. These experts highlight a growing body of evidence unequivocally linking climate change to detrimental health outcomes across the population.

The fundamental mechanism behind rising global temperatures is the accumulation of greenhouse gases in the atmosphere, which trap heat and create a warming effect akin to a blanket around the Earth. This phenomenon leads to increased global average temperatures, exposing more individuals to dangerous heat more frequently. While mild heat-related illnesses are often recoverable, prolonged or extreme exposure, particularly without adequate hydration and cooling, can be fatal. Vulnerable groups, including outdoor workers, the elderly, and individuals with pre-existing heart, lung, or kidney conditions, face the greatest risks. Globally, heat-related deaths have seen a stark increase, rising by 23% between the 1990s and the 2010s, resulting in over half a million heat-related fatalities annually during that period. In the United States, the devastating 2021 Pacific Northwest heat dome alone claimed hundreds of lives. Climate scientists project that as climate change intensifies, numerous regions worldwide, including major U.S. cities such as Miami, Houston, Phoenix, and Las Vegas, will experience an alarming increase in days where extreme heat poses a direct threat to human survival.

Beyond extreme heat, climate change exacerbates extreme weather events, with profound health implications. Warmer air holds more moisture, leading to increased rainfall intensity and more severe storms, which have resulted in widespread flooding across many U.S. communities in recent years. Concurrently, warmer ocean waters fuel more powerful hurricanes. The health risks associated with increased flooding are multifaceted, encompassing drownings, injuries, and the contamination of water sources with pathogens and toxic chemicals. Individuals involved in cleaning up flooded homes are also exposed to risks from mold growth, physical injuries, and significant mental distress. Furthermore, climate change intensifies droughts, disrupting food supplies and contributing to respiratory illnesses due to increased dust. The combination of rising temperatures and aridity dries out forests and grasslands, creating conditions ripe for devastating wildfires.

Wildfires, a direct consequence of changing climate patterns, significantly worsen air quality nationwide. The smoke generated by these fires is a toxic mixture of microscopic particles, known as fine particulate matter (PM2.5), which can infiltrate deep into the lungs. It also contains hazardous compounds like lead, formaldehyde, and dioxins released during the high-temperature combustion of homes, vehicles, and other materials. These smoke plumes can travel thousands of miles, triggering heart attacks, elevating lung cancer risks, and causing a spectrum of other health problems. Simultaneously, warmer conditions promote the formation of ground-level ozone, a potent irritant to the heart and lungs. The combustion of fossil fuels, a primary driver of climate change, also releases dangerous air pollutants linked to a wide array of health issues, including heart attacks, strokes, asthma exacerbations, and lung cancer.

The impact of climate change extends to the spread of infectious diseases. As cold-blooded organisms, insects are highly sensitive to temperature fluctuations. Rising temperatures accelerate mosquito biting rates and the development of disease agents they transmit. Mosquito-borne illnesses like dengue fever are increasingly being detected in regions of the United States, including Florida, Texas, Hawaii, Arizona, and California. New York state has recently reported its first locally acquired case of chikungunya virus, also transmitted by mosquitoes. Beyond insect-borne infections, warmer temperatures contribute to an increase in diarrheal and foodborne illnesses, including those caused by Vibrio cholerae and other bacteria. Heavy rainfall exacerbates sewage-contaminated stormwater overflows into lakes and streams. Conversely, drought conditions in the desert Southwest heighten the risk of coccidioidomycosis, a fungal infection commonly known as valley fever.

The health impacts of climate change are diverse and far-reaching. Longer pollen seasons contribute to increased allergen exposure and exacerbate respiratory conditions. Declining crop yields threaten access to nutritious foods, impacting overall public health. Mental health is also significantly affected, with increased rates of anxiety, depression, and post-traumatic stress disorder following climate-related disasters. Studies have also indicated a correlation between high-temperature days and increased instances of violent crime and suicide. Certain demographics are disproportionately vulnerable, including young children, older adults, pregnant women, and individuals with pre-existing medical conditions. Lower-income populations face heightened risks due to higher rates of chronic disease, greater exposure to climate hazards, and limited resources for protection, medical care, and recovery from environmental disasters.

The scientific evidence unequivocally demonstrating the link between climate change and human health has grown substantially since 2009 and is now considered incontrovertible. Numerous studies confirm that heat exposure, air pollution, the spread of infectious diseases, and food insecurity, all exacerbated by climate change, are worsening and collectively result in millions of deaths worldwide each year. This scientific consensus aligns with the lived experiences of many Americans who have personally suffered health consequences from extreme heat waves, struggled to breathe in wildfire smoke, or sustained injuries while recovering from hurricane damage.

Despite this overwhelming evidence, the Trump administration’s decision to rescind the endangerment finding represents a deliberate disregard for the established scientific consensus on the health impacts of climate change. This move is part of a broader strategy that includes reducing support for renewable energy and subsidizing fossil fuel industries, which are significant contributors to public health threats. In addition to revoking the endangerment finding, the administration also sought to roll back emissions limits on vehicles, the primary source of U.S. carbon emissions and a major contributor to harmful air pollutants like PM2.5 and ozone.

The benefits of addressing climate change extend beyond mitigating risks; they also promote positive health outcomes. When governments implement policies to reduce the drivers of climate change, they simultaneously tackle some of the world’s most pressing health challenges. Transitioning to cleaner vehicles and electricity generation leads to improved air quality, consequently reducing the incidence of heart and lung diseases. Encouraging walking and cycling through safe infrastructure promotes physical activity and lowers the risk of chronic diseases. In essence, confronting climate change is intrinsically linked to promoting good health. Therefore, to genuinely improve the health of the nation, it is imperative to acknowledge the scientific facts underpinning the endangerment finding and accelerate the transition from fossil fuels to a clean, healthy energy future.