Climate Change Health Impacts: Scientific Studies Calculate Major Dangers Amid Trump Skepticism

Understanding the Clash Between Science and Policy

Recent developments have thrust the health implications of climate change into the spotlight. On February 12, 2026, the U.S. Environmental Protection Agency (EPA), under the Trump administration, revoked its longstanding 2009 endangerment finding. This determination had established that greenhouse gases like carbon dioxide and methane, primarily from fossil fuel burning, pose a threat to public health and welfare. President Trump described the original finding as a 'scam' with no bearing on human health during the announcement. Yet, this move contrasts sharply with a mounting body of scientific research from trusted U.S. institutions, universities, and global health organizations.

Thousands of peer-reviewed studies—over 29,000 since 2009, with more than 5,000 focused on the United States—demonstrate clear links between human-induced climate change and adverse health outcomes. More than 60 percent of these studies emerged in the last five years alone, reflecting accelerating evidence as temperatures rise. From extreme heat killing thousands annually to the spread of infectious diseases and worsening air quality, the risks are quantifiable and growing. This article delves into the evidence, explores affected populations, and outlines practical steps forward, drawing from academic research and reports.

📊 Quantifying the Direct Toll: Key Scientific Evidence

Scientific studies provide precise calculations of climate change's health burden. A landmark analysis published in the Journal of the American Medical Association (JAMA) tracked heat-related deaths across the U.S. from 1999 to 2023. Researchers identified 21,518 such fatalities using data from the Centers for Disease Control and Prevention (CDC). The age-adjusted mortality rate climbed 63 percent, from 0.38 per 100,000 people in 1999 (1,069 deaths) to 0.62 in 2023 (a record 2,325 deaths). Post-2016, the annual increase accelerated to 16.8 percent, coinciding with record global warmth.

Attribution science further pins these trends on human activities. A 2021 study in Nature Climate Change examined 732 locations in 43 countries, including 210 U.S. sites, attributing over one-third of heat deaths to climate change—equating to more than 9,700 excess global deaths yearly. Closer to home, a February 2026 AGU Advances paper revealed that 2.2 percent of summer deaths in Texas from 2010 to 2023 stemmed from intensified heat events driven by warming.

The September 2025 National Academies of Sciences, Engineering, and Medicine report reaffirmed the 2009 EPA finding with even stronger evidence, citing longer observational records and new risks uncovered since then. Globally, the World Health Organization (WHO) projects 250,000 additional annual deaths between 2030 and 2050 from heat stress, malnutrition, diarrhea, and malaria alone, with direct health costs of $2-4 billion yearly by 2030. A 2025 Nature Climate Change review of attribution studies documented losses from $10 billion annually worldwide, including U.S. contributions from wildfires and storms.Read the JAMA study | National Academies report

Extreme Heat: The Most Immediate Threat

Extreme heat exemplifies climate change's health dangers. As global temperatures rise—2023 marked the hottest year since records began in 1850—heatwaves become longer, hotter, and deadlier. The human body struggles to cool itself above certain thresholds, leading to heat exhaustion, stroke, and organ failure. Vulnerable groups like outdoor workers, the elderly, and those with heart conditions face amplified risks.

Beyond deaths, morbidity surges. Emergency room visits for heat illness spike, straining healthcare systems. Cold-related deaths, while more numerous (13 times higher than heat deaths historically), are declining as winters warm, but the net effect favors rising mortality. Urban heat islands exacerbate this in cities, where concrete absorbs and re-radiates heat.

• 117 percent increase in U.S. heat deaths from 1999 to 2023
• 2021 Pacific Northwest heat dome: 600+ deaths, 150 times more likely due to climate change
• Projections: Dozens more 'survival-threatening' hot days yearly in cities like Phoenix and Miami

Researchers at universities like Boston University School of Public Health emphasize that lower-income communities bear disproportionate burdens due to poor housing insulation and limited air conditioning access.

Broader Impacts: Storms, Pollution, and Disease Vectors

Climate change amplifies multiple pathways to illness. Warmer air holds more moisture, fueling intense storms and floods that cause drownings, injuries, contamination outbreaks, and mold-related respiratory issues. Droughts and wildfires, like those ravaging the West, release fine particulate matter (PM2.5)—tiny particles penetrating deep into lungs and bloodstreams, triggering heart attacks, strokes, and asthma.

Ground-level ozone, worsened by heat, irritates airways. Infectious diseases thrive too: Warmer conditions expand mosquito ranges, bringing dengue to Florida and Texas, chikungunya to New York, and valley fever in the Southwest. Heavy rains overflow sewage, spreading pathogens like Vibrio; pollen seasons lengthen, aggravating allergies.

• Wildfire smoke: Travel thousands of miles, containing toxins like formaldehyde
• Food insecurity: Droughts reduce crop yields, impacting nutrition
• Mental health: Post-disaster PTSD, 'eco-anxiety,' and heat-linked suicides

A 2025 Nature study monetized these at billions annually, underscoring urgency.Explore the Nature attribution review

Health Disparities: Who Suffers Most?

Not all Americans face equal risks. Socially vulnerable groups—low-income, Black and Latino communities, Indigenous populations, pregnant individuals, children, and the elderly—experience heightened exposure. These populations often live in heat-trapped urban areas, lack cooling resources, and have higher chronic disease rates like diabetes and hypertension, which impair heat tolerance.

PubMed lists over 5,447 U.S.-focused studies in the past five years on climate-health inequities. For instance, climate-driven nutrition gaps hit frontline communities hardest, as altered weather affects food production. Structural factors, including limited healthcare access, compound vulnerabilities.PubMed climate-health studies

Higher education plays a key role here, with professors and researchers at institutions like UC Irvine studying these dynamics. Platforms like Rate My Professor can help students connect with experts in environmental health.

Political Skepticism Versus Scientific Consensus

The EPA's repeal removes the legal foundation for many climate regulations, from vehicle standards to power plant emissions. Critics, including the American Public Health Association, argue it disregards decades of evidence. Yet, the scientific community remains unified: Bodies like the WHO and National Academies affirm risks, independent of policy shifts.

Trump's skepticism echoes earlier doubts, but data from diverse sources—CDC, NOAA, peer-reviewed journals—shows undeniable trends. This tension highlights the need for evidence-based discourse in academia and policy.Stay updated on higher ed news

Solutions: Adaptation, Mitigation, and Actionable Steps

Addressing climate health risks requires dual strategies. Mitigation cuts emissions through clean energy transitions, electric vehicles, and reforestation, yielding co-benefits like reduced air pollution. Adaptation builds resilience: Early warning systems, cooling centers, urban green spaces, and vector control.

• Invest in heat action plans: Alerts, hydration stations for workers
• Enhance surveillance: Track diseases like dengue via public health networks
• Equity focus: Subsidize AC for low-income homes, improve disaster preparedness
• Research innovation: AI for predictions, vaccines for emerging pathogens

Individuals can advocate, reduce personal emissions, and prepare emergency kits. For professionals, careers in climate-health research abound—higher ed research jobs at universities tackle these challenges daily.WHO climate health resources

Photo by Markus Winkler on Unsplash

Looking Ahead: Careers and Contributions in Climate-Health Research

Higher education is pivotal in combating these risks. Faculty in public health, environmental science, and epidemiology lead studies quantifying impacts and devising solutions. Postdocs and research assistants analyze data from events like the 2023 heatwaves, informing policy.

Explore higher ed jobs in faculty positions or postdoc opportunities. Aspiring academics can craft standout applications using our guide to academic CVs. Share insights on professors via Rate My Professor, and check career advice for thriving in this field. By engaging with university resources and jobs, you contribute to solutions amid ongoing debates.