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Scholarly Perspectives

Climate Change and the Practice of Medicine: Essentials for Resident Education

Philipsborn, Rebecca Pass MD, MPA; Sheffield, Perry MD, MPH; White, Andrew MD; Osta, Amanda MD; Anderson, Marsha S. MD; Bernstein, Aaron MD, MPH

Author Information
doi: 10.1097/ACM.0000000000003719
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Abstract

To care for patients in the changing climate, tomorrow’s physicians require education on the health effects of climate change today. Climate change poses unprecedented risks to health and welfare, particularly those of children, the elderly, pregnant women, those with existing chronic health conditions, and those living in poverty.1,2 The burning of fossil fuels and other industrial and agricultural activities have increased heat-trapping greenhouse gases in Earth’s atmosphere. As a result, sea levels are rising, oceans are more acidic, and extreme weather events, including hurricanes, droughts, floods, forest fires, and heat waves, are more dangerous. These effects of climate change alter the incidence and severity of illnesses and impair the ability of physicians and health care systems to deliver medical care.

The Case for Climate Change and Health Education for Residents

Because of the far-reaching implications of climate change for health, authors have recently called upon physicians to learn more about it.3 The American Medical Association (AMA) passed a resolution in June 2019 supporting inclusion of climate change and health in medical education at the undergraduate, graduate, and continuing medical education levels.4 More than 70 health care organizations, including the AMA, the American College of Physicians, the American College of Emergency Physicians, the American Academy of Pediatrics, and Physicians for Social Responsibility, have declared climate change a health emergency and advocated greater engagement of the health sector in climate action.5

Residents in all specialties require basic knowledge of the health effects of climate change to care for patients amid the ongoing climate crisis; however, the specific application of this knowledge to patient care and health care delivery varies by specialty. Residents in emergency medicine benefit from relatively more training in disaster response. Those in internal medicine, family medicine, and pediatrics must learn to tailor anticipatory guidance to protect patients from climate-related health threats. Any resident involved in direct patient care will confront climate-related mental health concerns—from anxiety about what climate change portends to a greater incidence of mental health symptoms and disorders stemming from disruption of life and livelihoods, displacement, disasters, and heat exposure—which, in turn, necessitate close coordination with psychiatry and mental health services.

Residents are poised to learn routine guidance to provide to patients on healthier habits that reduce greenhouse gas emissions, and the right training can empower residents to advocate (in their places of practice, within medical societies, and through policy change) climate measures that reduce harms to human health and promote health equity.6 To that end, in this article, we propose the first (to our knowledge) climate and health curricular framework for medical residents linked to the Accreditation Council for Graduate Medical Education (ACGME) core competencies.

A Framework for Climate and Health Content

Here, we provide evidence-informed content on climate change and health organized into 3 domains: (1) knowledge of climate change and its effects on health, (2) climate change–related adaptations for clinical practice, and (3) implications of climate change for health care delivery. Appendix 1 distills the evidence base into specific learning objectives (LOs) for trainees at the graduate medical education level. While crafted for generalist programs—pediatrics, internal medicine, and family medicine—whose leaders seek to address expeditiously the climate and health knowledge gap of graduating residents, this framework could be adapted to meet program needs across specialties.

Knowledge of climate change and its effects on health

Heat-related illness.

Since heat waves are becoming more frequent and severe throughout the United States, physicians must understand that extreme heat poses a direct threat of heat exhaustion, heat stroke, and increased mortality.7 Heat waves worsen common illnesses, including asthma, mental health disorders, diabetes, renal insufficiency, and infectious gastrointestinal diseases.2 Maternal exposure to extreme heat during pregnancy is linked to premature birth, low birth weight, and congenital anomalies.8 Risk for heat-related illness varies with location, age, activities, and socioeconomic and health status. Some populations (e.g., infants, the elderly, pregnant women) are more vulnerable to extreme heat, while others (e.g., athletes, outdoor workers, those without air-conditioning) are at greater risk of exposure. Research suggests that physiologic and behavioral adaptations occur over time: those least accustomed to heat face greater risk of heat-related illness.9 Training on the health implications of extreme heat in populations with physiologic vulnerability or greater risk of exposure will better prepare physicians to recognize heat illness and provide targeted counseling—like heat action plans—to at-risk patients.

Air quality and respiratory illness.

Climate change compromises air quality and respiratory health in several ways.10 While aeroallergens and pollution are important triggers for asthma, providers and patients may not routinely monitor air quality and pollen indices to proactively inform disease management. Both the prevalence and severity of environmental allergies are increasing because of climate-driven factors: longer pollen seasons, more pollen, and increased pollen potency.11,12 Climate change also contributes to air pollution, which impairs lung development in children and contributes to asthma burden in patients of all ages.1,13 Higher temperatures promote the formation of ground-level ozone. Inhaled ozone decreases lung function and increases asthma incidence and severity, with those of low socioeconomic status disproportionately harmed.10 The joint effects of heat and ozone exposure may result in hundreds of thousands of school absences and over 1 million cases of acute respiratory symptoms by 2030 if greenhouse gas emissions continue on the same trajectory.14

Particulate air pollution also causes oxidative stress and inflammation, which contribute to asthma exacerbations and decreased lung function—even in individuals without asthma.13,15 In addition to air pollution from industry and transportation, wildfires linked to drought and heat create particulate pollution that degrades air quality over large areas.16 In 2018, the San Francisco Bay Area had the worst air quality in the world because of wildfire smoke,17 and particulate matter from these fires reached all the way to Massachusetts.18 Further, climate models suggest that wildfires and associated particulate pollution are likely to increase in the arid west and in eastern Canada, affecting multiple U.S. East Coast cities.1 Wildfire smoke contains a host of pollutants, including acrolein (a lung irritant), benzene (a carcinogen), and polyaromatic hydrocarbons (carcinogens and neurotoxins). Particulate respirators that are certified N95 or P100 help protect adults exposed to outdoor smoke or those who experience health effects from outdoor or indoor smoke.19 Because tight mask seals are not possible for children, families with young children are advised to minimize exposure and use household high-efficiency particulate air filters when possible. Physicians need to understand air quality recommendations relevant to their patients and provide appropriate guidance based upon them.

Infectious diseases.

Climate change is altering where and when vector-borne diseases occur. Lyme disease is the most prevalent vector-borne disease in the United States.20 Lengthier warm seasons, milder cold seasons, and land use changes have enabled Ixodes scapularis ticks that carry the Lyme disease bacterium (i.e., Borrelia burgdorferi) to extend their range northward each season. Lyme disease is expected to become even more widespread in the continental United States, and infections will likely occur earlier in the spring and linger later into the fall due to a lengthened tick season.21 Climate change also influences the range of Aedes species mosquitos and may create conditions more favorable for spread of dengue, chikungunya, and Zika in some parts of the United States.22

Climate change has intensified Earth’s water cycle; heavy downpours are more common in the United States and are projected to worsen in coming decades.23 Heavy rainfall increases pathogen load in municipal drinking water systems and contributes to outbreaks of waterborne diseases, particularly in children.24 Transmission of pathogens via piped water in the United States has been estimated to result in millions of cases of acute gastroenteritis each year.25 Climate-sensitive waterborne pathogens include the following: Campylobacter, Cryptosporidium, Escherichia coli, Giardia, hepatitis A virus, nontyphoidal Salmonella, and Shigella.26 To avoid delays in diagnosis and provide appropriate care, physicians must adapt their differential diagnoses of infectious etiologies based upon the changing climate.

Malnutrition and food insecurity.

In 2017, 2.9 million households in the United States, including 15.7% of those with children, were food insecure.27 Climate change can destabilize food systems and promote food insecurity.28 Extreme weather events damage crops, harm livestock, and disrupt food distribution. Some food crops contain lower levels of iron, zinc, and protein when grown under higher carbon dioxide concentrations, potentially increasing risk of micronutrient deficiencies as carbon dioxide concentrations accumulate.29 Climate models predict more droughts in the nation’s produce- and meat-producing regions.23 Agricultural losses from extreme weather events may drive higher food prices, further contributing to food insecurity. While some physicians already routinely screen for this social determinant of health, physicians have ever more reason to screen for food insecurity and take proactive measures (e.g., providing referrals to food banks) to prevent hunger when acute shocks to the food system, such as the COVID-19 pandemic, arise.

Injuries and toxic exposures.

Climate-driven extreme weather poses risks of direct injury as well as indirect illness from toxic exposures. Hurricanes and extreme flooding have mobilized coal ash and chemicals from storage sites, with risks for surrounding communities. In 2018, Hurricane Florence caused the breaches of coal ash pits into the Neuse and Cape Fear Rivers and into recreation areas in North Carolina.30 Many other storage sites are vulnerable to similar breaches and subsequent flooding. Children living near coal ash, which contains heavy metals, including lead, arsenic, and mercury, have a greater incidence of allergies, gastrointestinal complaints, and attention-deficit/ hyperactivity disorder requiring recognition and referrals.31 Hurricane Harvey deposited more than 5 feet of rain over parts of Houston, Texas, in 2017, inundating 5 Environmental Protection Agency–designated Superfund sites, which are laden with toxic substances, and flushing more than 500,000 gallons of gasoline from storage tanks.32

Extreme weather events are the most common cause of power failures in the United States, affecting about 25 million people per year.33 After storms that cause power outages, carbon monoxide poisonings increase due to reliance on poorly ventilated or poorly functioning generators.34 In the 9 days following landfall of Hurricane Irma in 2017, there were 91 carbon monoxide poisonings in Miami-Dade County alone.35 In all states impacted by Hurricane Irma, there were more deaths from carbon monoxide poisoning than from direct injury from the hurricane itself.36

Climate change is also contributing to the emerging risk of exposure to harmful algal and cyanobacterial blooms. Warmer temperatures and heavy rainfall (which flushes nitrogen and phosphorus into coastal waters and lakes) promote the growth of algae and cyanobacteria.37 With sufficient nutrients, sunlight, and slow-moving water, blooms produce toxins that cause rashes (with contact), vomiting and diarrhea (if ingested), and breathing difficulty (when aerosolized and inhaled).38 As blooms are becoming more common, the One Health Harmful Algal Bloom System—a national system tracking algal blooms and their influence on health—was launched in 2016 to quantify the effects of this emerging threat.39,40 As illnesses associated with harmful algal and cyanobacterial blooms become more common and better characterized, physicians need to understand their presentation and management.

Mental health disorders and displacement.

Climate change increases the odds that an individual will experience protracted disruption of routines and psychological trauma. Exposure to extreme weather is associated with adverse mental health outcomes in children and adults, including posttraumatic stress disorder, anxiety, and depression.41,42 Among children exposed to extreme weather events, more than a third receive new mental health diagnoses and more than 10% have persistence of symptoms a year after the event.43,44 One of the most powerful determinants of mental health concerns is displacement. Almost 2 years after Hurricane Katrina, approximately 85% of 372,000 displaced children had not returned home. Their parents reported persistent emotional or behavioral challenges, gaps in schooling, and challenges to accessing pediatric health care.45 Disasters also stress caregivers and undermine support systems for parents. By compounding parental stress and mental health concerns, displacement contributes to adverse childhood experiences, which can harm the emotional and social development of children, affecting them into adulthood.46 About 24 million people worldwide have been displaced each year since 2008 due to extreme weather and other climate-related disasters.47 Familiarity with behavioral and mental health sequelae of displacement is a prerequisite for physicians to screen for them, which, in turn, supports trauma-informed care for locally and globally displaced climate migrants.

Extreme weather events intensify the risk factors, including chronic stress, economic insecurity, food insecurity, and social isolation, that contribute to poorer mental health. As one example, according to multiple studies, exposure to heat has been associated with suicide risk in adults.48 Climate change has led to many reports of anxieties about the effects of its harms on human existence and a fear of environmental doom—so-called ecoanxiety.49 At the same time, emerging evidence indicates that climate change mitigation can improve mental health outcomes. Greater exposure to greenspace throughout childhood, for instance, has been associated with a markedly lower risk of mental health disorders.50 By recognizing climate change–related determinants of mental health, trainees will more ably care for at-risk patients, provide referrals for mental health services, and coordinate care with psychiatry colleagues.

Climate change–related adaptations for clinical practice

Knowledge of the pathways that link climate change and health will enable residents to integrate patient- and location-specific climate risks into more effective disease prevention and treatment plans. Tailored guidance will help patients and families avoid harmful climate-related exposures and prepare for the sequelae, especially those related to health, of climate change. The young, the elderly, those with chronic diseases (e.g., diabetes, asthma), those with physical or developmental disabilities, and those dependent on mechanical therapies (e.g., dialysis, ventilator support) all require additional counseling (Chart 1). Potential barriers to accessing care due to climate-driven disasters make contingency planning essential, especially for vulnerable individuals. Patients face changing risks because of climate change; future physicians require training to adapt care plans to these changing risks.

Physicians have an obligation to inform patients about treatments that pose heightened risks because of climate change. Many common medications (e.g., beta-blockers, stimulants, diuretics, laxatives) affect body temperature or water homeostasis and confer added risk of heat illness and dehydration in heat waves.1 Antihistamines (e.g., diphenhydramine), anticholinergics, carbonic anhydrase inhibitors (e.g., acetazolamide), and tricyclic antidepressants (e.g., amitriptyline) can affect thermoregulation and impair sweating.51 Other medications necessary for acute illness management have altered pharmacology (e.g., epinephrine, insulin) or altered dose delivery (e.g., albuterol) above room temperature.52 Medications stored outdoors or in cars or delivered by mail order can be exposed to temperatures above those recommended for ensuring medicine integrity and proper medical device function.

Physicians also can provide guidance in routine clinical encounters on lifestyle choices that not only improve individual health in the near term but also collectively reduce greenhouse gas emissions and help secure public health gains in the long term. Reduced reliance on single-occupancy vehicles and the use of alternative transportation options improve local air quality, reduce risks of harm from pollution, and improve physical fitness. The EAT-Lancet Commission on healthy diets from sustainable food systems emphasizes the importance of a plant-rich diet.53 Less consumption of red meat reduces greenhouse gas emissions while lowering the personal risk of chronic diseases, including colon cancer and premature death.

Implications of climate change for health care delivery

Health care delivery and disaster preparedness.

Climate change promotes disasters that both disrupt health care operations and require new strategies to safeguard care delivery. Supply shortages, power failures, and surges in patient volume necessitate robust disaster preparedness plans that include trainees. Even with plans in place, managing vulnerable patients in disasters is difficult. For example, patients at New York University’s Langone Medical Center required evacuation during Hurricane Sandy when power systems failed.54 Without electricity or access to electronic health records (EHRs), physicians—including residents—were integral to coordinating safe evacuation.

Resident trainees care for patients around the clock in many medical centers, yet they often have the least training in what to do in a disaster or power failure. Although many facilities have backup power, the duration of a blackout may exceed the time generators can power facilities—including servers that store EHR data. Most trainees have never used paper charts or functioned without EHRs and would benefit from training on how to write paper orders and how to navigate paper charts. Physicians and health facilities around the United States need to coordinate with public health officials and with one another during disasters when information, electrical, pharmacy, and/or laboratory systems may be compromised. Residents will be better equipped to minimize disruptions in patient care during disasters if they are included in disaster drills and integrated into a facility’s preparedness plan.

Extreme weather events threaten the availability of supplies and medications by not only disrupting the cold chain (i.e., the transport of items such as vaccines that require specific temperatures) and supply chains but also damaging production facilities. Hurricane Maria (September 2017) disabled a factory in Puerto Rico that produces small-volume intravenous fluid bags. As a result, hospitals struggled to provide essential fluids and medications well into 2018. After Hurricane Maria, the U.S. Food and Drug Administration monitored a list of 90 medical products for shortages, including 40 drugs.55 Disasters also create mismatches between patient need and health system demand, creating surges in volume from neighboring areas and even international sites. In 2017, Hurricane Irma prompted the evacuation of almost 7 million people from Florida, and physicians in regional centers such as Atlanta, Georgia, cared for climate migrants displaced from their familiar physicians and medical centers. In individuals displaced by global climate–related disasters and conflict, U.S. physicians may see unusual infectious diseases or more severe presentations of common illnesses.

Reducing health care’s contribution to pollution-related morbidity and mortality.

Health care is the second most energy-intensive sector in the United States, producing 9%–10% of U.S. greenhouse gas emissions.56 The amount of pollution associated with the U.S. health care system is responsible for an estimated loss of about 405,000 disability-adjusted life years—on par with the lives lost due to medical error.57 Many hospitals and academic health centers face mandates from their states or municipalities to achieve net-neutral greenhouse gas emissions. Efforts to improve health care efficiency, reduce waste, and reign in unnecessary resource expenditure on deviations from evidence-based guidelines that result in overdiagnosis and overtreatment will all aid institutions in these efforts. To comply with the ACGME’s mandate that trainees participate in quality improvement (QI) projects through their residency program, faculty and residents could create QI projects to advance institutional decarbonization, disaster preparedness, or climate resiliency. Program directors, hospital leaders, and institutional officials can incorporate lessons learned from previous climate events to prepare their institutions and trainees for climate-associated disasters.58

Physicians as climate advocates

The climate-and-health education outlined above will empower future physicians as advocates who can represent the health implications of climate change to policymakers and legislators. By presenting the health, including mental health, basis for climate change mitigation and adaptation measures, physicians can help encourage policies that safeguard the health of patients. For example, more exertional heat illness occurs in states that do not have mandated guidelines to reduce heat exposure in high school athletes.59 Climate change worsens existing health inequities. For example, urban heat islands disproportionately affect communities of color. Disproportionate exposure to extreme heat in these urban settings has been linked to the historical and structurally racist housing policy known as redlining.60 Physicians can advocate policies that dismantle structural injustice, protect patients, and avoid worsening health inequities among at-risk populations. Chart 1 identifies educational implications to consider in designing curricula to address the large burden of climate-associated conditions that occur in at-risk, vulnerable, disadvantaged, medically complex, or special populations. These principles can be used to build foundational and specialized educational formats and experiences for residency training.

Chart 1
Chart 1:
At-Risk Patient Populations and Their Vulnerabilities in Climate-Related Extreme Weather

Implementation of Climate and Health Educational Content in Residency Training

Education on climate change and health will benefit physicians caring for patients today and over the coming decades. Given institutional resource constraints and potential lack of faculty expertise, a climate and health toolkit might be coordinated through a national organization that could convene subject matter experts and leaders in residency education. Similar approaches have been taken for the creation of other national curricula.61 However, this approach will take time, and trainees need to be prepared to care for their patients already experiencing the health impacts of climate change. We recommend, therefore, that training programs use the curricular framework (Appendix 1) for creation of local content while a consortium is creating a more robust national toolkit. The desired outcomes of a climate and health curriculum include demonstrated competencies in the following domains: (1) knowledge of climate change and its effects on health, (2) climate change–related adaptations for clinical practice, and (3) implications of climate change for health care delivery. Built for these outcomes, Appendix 1 includes proposed LOs mapped to ACGME core competencies as well as suitable learning formats and assessment strategies for each LO. Notes and comments about individual LOs are also included. We have provided Appendix 1 especially for program directors without access to individuals with expertise on climate change and health so that they can easily identify the major learning points and clinical conditions that address the LOs of our proposed curriculum. Subspecialty faculty, school of public health faculty (if available), and public health physicians are all individuals who could potentially help integrate and teach portions of this curriculum.

Residency program leaders may design curricula differently so that they are tailored to climate risks for their geography, their local populations, and their missions. Similarly, different programs will use different strategies for implementing LOs and assessing learning. Some residency training programs may choose to integrate LOs into rotations where alignment already exists. For example, education on wildfires and lung disease might be integrated into primary care or pulmonary rotations. Clinical rotations and/or electives in outpatient primary care, social medicine, inpatient care, psychiatry, allergy–immunology, emergency medicine, infectious disease, and nephrology (among others) are also all appropriate places to integrate pieces of the curriculum. Other training programs may prefer to designate a rotation to provide training on most of this content in a concentrated block. LOs could also be delivered at resident noon conferences or academic half days, including via active learning formats, such as small-group, case-based discussions (among others). Because all residents may not see each climate-related condition during the course of their clinical training, the suggested learning formats provide for consistent delivery of material to achieve the LOs for all postgraduate trainees. Notably, some LOs (those further down the list) increase in complexity and cross-competencies. This allows residencies to arrange LOs for knowledge and skill building over the course of delivery of their curriculum.

The Way Forward

In the context of calls from within the United States and around the world for the health sector to prepare for climate change, our proposed curricular framework for residents will support training programs whose leaders are seeking to incorporate climate change and health content. It can inform the development of more detailed content, assessment strategies, and toolkits on this subject. By learning how climate change affects individual and population health, clinical care, and health care delivery, residents will be prepared to care for patients who face growing threats to their health and well-being from climate change.

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Appendix 1 A Curricular Framework Linking Climate and Health Learning Objectives for Resident Education to ACGME Core Competencies, Suggested Learning Formats, Assessment Strategies, and Specific Curricular Content

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