EbiExtremeWeatherandPopHealth.pdf

Extreme Weather and Climate Change: Population Health and Health System Implications

Kristie L. Ebi1, Jennifer Vanos2, Jane W. Baldwin3, Jesse E. Bell4, David M. Hondula5, Nicole A. Errett6, Katie Hayes7, Colleen E. Reid8, Shubhayu Saha9, June Spector6,10, Peter Berry11

1Center for Health and the Global Environment, University of Washington, Seattle, Washington 98195, USA

2School of Sustainability, Arizona State University, Tempe, Arizona 85287, USA

3Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA

4Department of Environmental, Agricultural, and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska 68198, USA

5School of Geographical Sciences, Arizona State University, Tempe, Arizona 85287, USA

6Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, Washington 98195, USA

7Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, M5S 2S2, Canada

8Geography Department, University of Colorado, Boulder, Colorado 80309, USA

9Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, USA

10Department of Medicine, School of Medicine, University of Washington, Seattle, Washington 98195, USA

11Faculty of Environment, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

Abstract

Extreme weather and climate events, such as heat waves, cyclones, and floods, are an expression

of climate variability. These events and events influenced by climate change, such as wildfires,

continue to cause significant human morbidity and mortality and adversely affect mental health

and well-being. Although adverse health impacts from extreme events declined over the past

few decades, climate change and more people moving into harm’s way could alter this trend.

Long-term changes to Earth’s energy balance are increasing the frequency and intensity of many

extreme events and the probability of compound events, with trends projected to accelerate

under certain greenhouse gas emissions scenarios. While most of these events cannot be

completely avoided, many of the health risks could be prevented through building climate-resilient

[email protected] .AUTHOR CONTRIBUTIONSK.L.E. conceptualized the article; K.L.E., J.V., J.W.B., J.E.B., D.M.H., N.A.E., K.H., C.E.R., S.S., J.S., and P.B. contributed to the writing, editing, revising, and finalizing of the manuscript.

HHS Public AccessAuthor manuscriptAnnu Rev Public Health. Author manuscript; available in PMC 2022 April 17.

Published in final edited form as:Annu Rev Public Health. 2021 April 01; 42: 293–315. doi:10.1146/annurev-publhealth-012420-105026.

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health systems with improved risk reduction, preparation, response, and recovery. Conducting

vulnerability and adaptation assessments and developing health system adaptation plans can

identify priority actions to effectively reduce risks, such as disaster risk management and more

resilient infrastructure. The risks are urgent, so action is needed now.

Keywords

climate change; climate variability; extreme events; population health; health systems

1. INTRODUCTION

Worldwide, in 2019, there were 396 disasters1 that killed 11,755 people, affected 95 million

others, and cost nearly US$130 billion (28). Asia was the most affected continent with

40% of the events, 45% of the deaths, and 74% of all people affected. Floods and storms

accounted for 68% of the number of affected people worldwide. Anthropogenic greenhouse

gas (GHG) emissions, land use change, and other activities impacting the global energy

balance are altering the frequency and intensity of many extreme weather and climate

events, with some regions experiencing increases in heat waves, floods, and droughts (84).

Events influenced by climate change, particularly wildfires, also are increasing.

Risks from extreme weather and climate events arise from the intersection of the physical

hazard (e.g., wind and rain), the extent of exposure to the hazard, the vulnerability of

individuals and communities, and the capacity to prepare for, manage, and recover from

extreme events.

A disaster generally is defined as a sudden, calamitous event that disrupts the functioning

of a community or society and that exceeds its ability to cope using its own resources (81).

The occurrence of an extreme event is not required for a community or region to experience

extreme impacts, such as large increase in mortality; an extreme impact can arise from a

moderately strong event when it occurs in a highly vulnerable population. The converse

also is true, that an extreme event may not result in extreme impacts when communities are

prepared.

Roughly 20% of disasters in 2019 occurred in North America, including the Caribbean and

Central America, for total damages of US$55 billion, of which US$29 billion were insured

(130). Loss events included Hurricane Dorian, which caused billions of dollars in damage,

especially in the Bahamas, in late August to early September. Heavy losses that year also

resulted from severe weather, floods, and a winter storm in the United States. A mixture of

snowmelt triggered by unusually high temperatures in March and storms with torrential rain

led to sustained and extensive flooding in Nebraska, South Dakota, Iowa, and Mississippi

(49).

1Natural disasters are not solely the consequence of biophysical, meteorological, or climatological events; human activities, such as placement of infrastructure and movement of people into vulnerable regions, also are required.

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Overall, the numbers and costs of disasters have been increasing for several decades due to

increases in exposure (more people moving into harm’s way and increases in the values of

property and infrastructure at risk), vulnerability of people and infrastructure, and climate

change (170). Since 1980, the United States has experienced 265 weather and climate

disasters in which the overall damages reached or exceeded US$1 billion; the total costs

were greater than US$1.775 trillion (132), with an estimated 14,223 deaths (an average of

356 per year), although the numbers of deaths are likely an underestimate (178).

Beyond the damage to infrastructure, extreme weather events and disasters can affect the

health and well-being of individuals and can have catastrophic impacts on communities

and health systems. People can suffer from a wide range of physical effects (e.g., heat

exhaustion, injuries in severe storms, and respiratory illnesses from molds due to floods)

as well as longer-term impacts on mental health. Health systems and facilities can be

affected by impacts on patients and health care staff, medical and nonmedical supplies,

facility operations, and critical infrastructures. To prepare for climate change, health-sector

and emergency-management officials—as well as urban planners, neighborhood services

staff, and others—require information about how hazards are projected to change, possible

future exposures of people and property, likely changes in population health and health care

infrastructure vulnerabilities, and needed capacities to prepare for and manage the events

and their aftermath.

We review (a) the current impacts and projected risks of climate change on the health of

populations and health systems from extreme weather and climate events and from wildfires,

(b) the value of disaster management to reduce health risks from these changes, and (c)

adaptation and mitigation measures that can explicitly address climate change in policies and

planning processes.

2. EXTREME EVENTS INFLUENCED BY CLIMATE CHANGE

Global land surface air temperature has risen 1.53°C since the preindustrial period of 1850–

1900, with considerable variation in regional warming; this increase is much larger than the

observed warming combined over land and oceans (0.87°C) (84). Climate models project

robust differences in regional climate characteristics, including extremes.

Detection and attribution analytic methods are increasingly being applied to determine

the effects of climate change on the frequency and/or magnitude of extreme events. For

example, in mid-September 2019, torrential rainfall from Tropical Storm Imelda caused

large-scale flooding in Southeast Texas, affecting an estimated 6.6 million people and

resulting in rescues of over 1,000 people and 5 deaths (171). The recorded precipitation at

the station with the highest total amount of rainfall from this event would be expected only

approximately once every 1,200 years.

The 2019 Intergovernmental Panel on Climate Change Special Report on Climate Change

and Land (84) concluded that warming since the period 1850–1900 has resulted in an

increased frequency, intensity, and duration of extreme events in most land regions,

including the following observations:

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• The intensity of heavy precipitation events increased across the globe.

• The frequency and intensity of droughts increased in some regions (including the

Mediterranean, West Asia, many parts of South America, much of Africa, and

Northeastern Asia).

• Desertification in some dryland areas (including in sub-Saharan Africa, parts of

East and Central Asia, and Australia) was associated with increased land-surface

air temperature and evapotranspiration and decreased precipitation amounts in

interaction with climate variability and human activities.

• The frequency and intensity of dust storms increased over the last few decades

due to land use and land cover changes and climate-related factors in many

dryland areas, such as the Arabian Peninsula and broader Middle East and

Central Asia.

Further, climate change is projected to continue and exacerbate these trends, including the

following:

• The frequency, intensity, and duration of extreme heat events are projected to

continue to increase through the twenty-first century, with all regions expected to

experience unprecedented temperatures.

• The frequency and intensity of extreme rainfall events are projected to increase

in many regions.

• The frequency and intensity of droughts are projected to increase, particularly in

the Mediterranean region and southern Africa.

There is a range of possible futures for each additional unit of global warming. For example,

regional projections of annual maximum temperatures across climate models where the

Earth warms 1.5°C under a scenario of high GHG emissions indicate there may be little

change in the single hottest day in a year in many regions if realized warming falls into

the lower quartile of projections (154). Alternatively, increases of 3°C to 5°C in maximum

temperatures could occur over most regions in the upper quartile of projections. With Earth

projected to warm 1.5°C between 2030 and 2052, the next few decades could be similar

to today in many parts of the world; or regions could experience significant and very rapid

warming. These projections have implications for the frequency and duration of extreme

heat events; the extent of increases in precipitation, including from hurricanes; and the rate

of sea-level rise that affects the health of future populations (particularly but not exclusively

in coastal regions) and their health systems.

2.1. Tropical Cyclones or Hurricanes

Tropical cyclones (TCs) that make landfall are among the most dramatic and costly

disasters. They have different names depending on the basin where they occur (hurricanes

in the northern Atlantic and northeastern Pacific, typhoons in the northwestern Pacific,

and cyclones in the southern Pacific or Indian Ocean) but are the same meteorological

phenomena. They cause strong winds and flooding from intense rainfall and a surge of ocean

water that causes dramatic damage to buildings and infrastructure along coastlines, often

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including widespread utility outages. TCs have cost the United States close to US$1 trillion

since 1980 (157). Low- and middle-income countries (LMICs) have suffered smaller total

economic losses, but the losses are often a larger proportion of their nations’ economies and

arguably have greater consequences for well-being (67).

Alongside physical damages, TCs are highly detrimental to human health (107). From 1963

to 2012, there were 2,544 deaths in the United States (~50 per year) directly caused by

the forces of TCs (e.g., drowning in floods caused by storm surge or extreme rainfall, or

physical trauma caused by windborne debris) (142). A comparable number of TC-related

deaths are indirectly caused in individuals with preexisting conditions exacerbated by the

stress or strain of a storm. Hurricane Katrina alone caused 520 direct deaths and 565 indirect

deaths (143). Accounts of individual TCs clearly indicate upticks in a variety of other health

problems that do not necessarily result in death, including injuries, diseases, skin infections,

and mental health impacts (e.g., 43, 73, 87, 141). New data sets of TC exposure history are

increasing possibilities for robust, long-term epidemiological studies of these diverse health

impacts from TCs (e.g., preterm birth; see 161) that will enhance our ability to predict and

prepare for future TC health impacts.

A confounding challenge in projecting future TC impacts is the relatively low confidence in

projections of TC changes with climate change. Projections suggest the most intense TCs

will likely increase in frequency and exhibit higher precipitation rates; however, there is

uncertainty whether the overall number of TCs may increase or decrease, with different

trends projected depending on the modeling approach (46, 103, 154). However, other

trends are clearly heightening TC risks to individuals and communities. Exposure to TCs

is increasing as people move to and settle along coastlines (57), and potential damages from

storm surge are increasing with sea-level rise (113).

2.2. Compound Events

Complicating projections of extreme-event impacts is the fact that many disasters

are the result of combinations of extremes (sometimes called compound, interacting,

interconnected, or cascading events) (140, 154). Compound extreme events consist of two or

more events interacting across time and/or space, such as back-to-back extreme heat events

or an extreme heat event coincident with a drought (184). The range of compound extremes

that might endanger human health is large. The study of compound extremes is a nascent

and rapidly evolving research area. In many cases, understanding of present and projected

risks of a particular compound extreme event is lacking, including key societal drivers of

vulnerability (144). We highlight a few types of compound climatic extreme events.

Heat waves are exacerbated when combined with other extreme events. Heat waves can

enhance buildup of ozone and other pollutants, leading to combinations of heat and air

pollution dangerous for human health (4, 111). A particularly striking example is the

combination of high temperatures, wildfire, and smoke that results in high levels of air

pollution across broad geographic areas. In recent summers, the western United States has

been afflicted with multiple episodes; these are projected to become increasingly common in

the future because of climate change (114).

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Positive feedback loops also occur between heat waves and droughts that heighten

temperature and desiccation (76, 185). Certain types of atmospheric waves can cause

multiple simultaneous heat waves distributed across the Earth; this may increase the risk

of multiple breadbasket failures (105). Many of the most impactful heat waves in terms

of mortality might be better understood as the combination of a number of heat extremes

occurring in sequence, separated by short cooler breaks—a temporally compound heat wave

event. The proportion of heat wave hazards coming from these temporally compound heat

waves is robustly projected to increase with global warming (7).

Past events highlight the dangers of compound extreme events involving TCs or extreme

precipitation and related flooding. For example, in 2005, Hurricane Katrina led to massive

flooding in New Orleans (153). Only a few weeks later, Hurricane Rita rebreached

weakened levees, leading to flooding once again. The nonlinear impacts of these

events likely exceeded vulnerability thresholds associated with protective infrastructures.

Significant research remains to understand the dynamics of such compound hydrological

extremes and to quantify risks to populations and communities (144).

3. POPULATION HEALTH AND HEALTH SYSTEM RISKS FROM EXTREME

EVENTS INFLUENCED BY CLIMATE CHANGE

There is high annual variability in the numbers of deaths from all disasters, with an average

of 60,000 deaths annually over the last decade, or 0.1% of all global deaths (148), with an

irregular and overall declining trend. Most of these deaths were in a few intensive disasters,

indicating that while the events may not be preventable, much of the loss of life can be

avoided through improved forecasts and early warnings, more resilient infrastructure, and

improved disaster risk management. However, there is a concern with climate change that

future events may be too large or intense for effective preparation.

The next sections summarize population health and health system risks from high ambient

temperatures, droughts, floods, and wildfires, followed by a discussion of the mental health

risks associated with extreme events influenced by climate change.

3.1. High Ambient Temperatures

The range of health effects of high ambient temperatures include discomfort, severe illnesses

requiring hospital care, mortality, and interactions with and modifications of work patterns,

recreation, and other activities.

3.1.1. Morbidity and mortality from heat waves.—At the global scale, the number

of hot days and nights has increased since the 1950s, while cold days and nights decreased

(154). Rising temperatures are directly connected to human health through heat-related

illnesses (e.g., heat exhaustion, heat syncope, and heat stroke) and death, with each

individual’s risk highly dependent on their exposure, location, and susceptibility. There

is a wide range of heat tolerance within populations and across regions. The human body

can physiologically adapt to heat to a certain extent depending on individual factors, local

climate, and types of heat exposure. Physiological factors (e.g., age, sex, preexisting illness,

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and medication or drug use) (23, 98) and behavioral or contextual factors (e.g., employment,

activity, clothing, income, and housing type) (6, 118) are known to affect thermoregulation

across day-to-day or hour-to-hour heat exposures. For example, in Maricopa County,

Arizona, 47% (93/197) of heat deaths in 2019 involved drug use as a cause of death or

contributing factor (124). Extreme heat events can disrupt health systems and services, for

example, through a surge in patient volumes, by closing operating theatres in high heat and

humidity conditions, or through impacts on health care professionals and patients (156).

Reducing risks to health from current and projected high temperatures—outdoors and

indoors—depends not only on physiological acclimatization but also on planned adaptation

by public health officials in concert with partners in other sectors. Heat action plans and

early warning systems that include a proactive response to assist vulnerable populations

and build awareness among the public and key stakeholders can lead to the adoption

of protective behaviors and reduction in morbidity and mortality (75, 156). Common

components of heat action plans and warning systems include opening of public cooling

shelters, targeted messaging, wellness checks, and water distribution (e.g., 9, 19). A study

by Eisenman et al. (44) found that as temperatures increased, heat-related mortality was

lower in census tracts with more publicly accessible cool spaces in Maricopa County,

Arizona. These and other preventative measures that may reduce heat exposures and increase

coping capacity as the climate warms are important for protecting health. Over longer time

scales, communities can be modified or designed with new or altered technologies and

infrastructures (e.g., cool facades, green roofs, shade structures, and reflective surfacing) to

reduce heat exposures in urban areas (119, 172). Heat-health adaptation measures can be

cost-effective and reduce utilization of health systems (61) but should be developed and

updated based on information about projected climate conditions (74).

Heat-related mortality has been declining in many industrialized countries in recent decades

(56). For example, deaths attributed to heat across 105 cities in the United States declined by

almost 63% from 1987 to 2005 (12). However, the extent to which continued declines could

be realized (or reversals avoided) largely depends on implementing effective adaptation

strategies (60). Heat-related mortality trends and optimal adaptation pathways or measures

differ by country based on culture, infrastructure, technology, and communication, among

other factors. Few studies have assessed heat-related mortality in LMICs due to lack of data

(56, 63, 134); over half of existing studies are from China (56%) or other Asian countries

(14%). LMICs typically have low-resource environments [including a lower prevalence of

air conditioning (AC)] and more often rely on altering behaviors and personal cooling to

stay safe (O. Jay, K. Ebi, P. Berry, C. Broderick, R. DeDear, et al., submitted manuscript).

These behaviors may include application of ice or ice towels, dousing skin, or saturating

clothing with water with added ventilation (fans) (26). Yet the effectiveness of these

actions depends on the climate context. For example, evaporative cooling with fans is more

effective in humid locations, whereas self-dousing and/or wetting of clothing when using

fans are preferable strategies in certain dry climates (128). Although AC use is growing

exponentially as the most popular heat-exposure reduction strategy globally (11), it is costly

and financially inaccessible for many of the most vulnerable, is energy intensive, emits

waste heat into the environment (150), and can increase the risk of power outages.

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Heat-reduction interventions may have economic and educational cobenefits. Park (137)

found that high school student test performance was reduced by 14% on days with high

(~32.2°C) outdoor temperatures compared to optimal (22.2°C) outdoor temperatures in

New York state. Hot school days may also disproportionately impact minority students,

accounting for ~5% of the racial achievement gap in the United States, in part because of

inadequate access to AC (138).

Finally, there is growing evidence linking extreme heat and rising temperatures to increased

hospitalizations for mood and behavioral disorders (22, 175) and evidence of increased

risk of suicide related to heat waves and rising temperatures (17, 34, 99). These risks are

projected to increase with further warming. Burke et al. (17) estimated that under a high

GHG emission pathway, there could be 9,000 to 40,000 additional suicide deaths throughout

Mexico and the United States by 2050. Mechanisms for how high temperatures impact

mental health remain poorly understood, with various nonclimatic confounders to consider

(e.g., macroeconomics and social factors); yet, biologically, there may be side effects from

thermoregulation and neurological responses to heat that adversely affect mental health (17).

3.1.2. Occupational health.—Individuals working under heat stress are more likely

to experience physiological heat strain (51) and heat-related illness, and exertional heat

stroke and death can occur in young, otherwise healthy workers performing heavy physical

labor (64). A global meta-analysis by Flouris et al. (51) found individuals working a single

shift under heat stress conditions were four times more likely to experience occupational

heat strain than in thermoneutral conditions (based on 11,582 workers across 9 studies),

with ~0.7°C higher core temperatures (1,090 workers, 17 studies) and 14.5% higher urine

specific gravity (a measure of solute concentration) (691 workers, 14 studies). In the

United States between 2000 and 2010, 359 occupational heat-related deaths were reported

(annual mean fatality rate 0.22 per 1 million workers), with agricultural and construction

workers at particularly high risk (64). Indoor workers subject to inadequate ventilation and

workers exposed to point heat sources are also at risk (152). Occupational heat stress is

hypothesized to contribute to the global epidemic of chronic kidney disease of unknown

etiology (177) and can lead to adverse birth outcomes among heat-exposed pregnant workers

(106). Working populations with the most social and economic disadvantages are often

more exposed to heat and may lack adequate health care access or other means to address

exposures and health effects (122).

The risk of adverse occupational health effects is likely to increase as the frequency and

severity of extreme heat waves increase (83). In a study of US agricultural workers,

climate change at its current pace is projected to double crop worker heat risk by the

mid-century and triple by the end-of-century, absent extensive restructuring of agricultural

labor (164). Increasing temperatures from local land use changes can magnify the impacts

of climate change, for example, in the setting of industrial clearing of tropical forests where

communities depend on subsistence agriculture and other outdoor work (183) and in areas

with growing urban heat island effects (152). In tropical and mid-latitude areas of the world,

Dunne et al. (38) estimated that heat stress has already reduced labor capacity by 10%

relative to the 1970s and projected a reduction of 40% by the year 2100 under a pathway

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of high GHG emissions. Further decreases in labor productivity and associated economic

impacts are projected, assuming adherence to occupational heat stress guidelines (38, 51).

3.1.3. Recreation.—High temperatures can also adversely affect people engaging in

outdoor sports and recreation and represent a growing challenge for the sports industry

(136). Heat is a leading cause of sudden death among athletes, and exertional heat illnesses

cause thousands of debilitating health outcomes annually (18). For large events facing

extreme heat (e.g., Tokyo Olympics), weather and climate data should be integrated into

the decision-making process for event schedules and venue locations (79). Unpredictable

disruptions from extreme weather may cost billions of dollars given the years of planning,

hundreds of thousands of people involved, and global media attention, yet such safety

precautions may help avoid serious risk to athletes (158). Coordination among local

stakeholders in emergency medicine, public health, and events/operations is necessary

to ensure that localized preparedness plans (e.g., identification of hot spots such as sun-

exposed locations, expected crowds, and midday events) systematically provide adequate

support for both athletic and social activities.

3.2. Droughts

The frequency and intensity of droughts are increasing with rising global temperatures and

changing precipitation patterns (165). These trends and associated risks are expected to

continue to intensify with climate change (77). Internationally, over the last two decades,

droughts affected more than one billion people (27). Africa is a quintessential setting for

examination of the roles that drought can play in human health and society, as droughts there

have led to mass migration, conflict, and devastating famine (54, 58). In the United States

since 1980, droughts classified as billion-dollar disasters were estimated to have caused

3,865 deaths, with most of the deaths due to heat waves accompanying drought (132).

Because of the difficulty in defining the beginning and end of a drought, the causal pathways

connecting droughts to health outcomes can be complex and difficult to monitor (10, 117).

The most commonly identified pathway is a reduction in water availability for societal

uses, both in quantity and quality as concentrations of pollutants increase (129). Stagnant,

warm waters from drought produce ideal conditions to promote growth of many freshwater

pathogens (32). Simultaneously, sudden heavy rains during drought conditions can increase

the likelihood of flooding.

Droughts are slowly evolving, and the disruptions to human systems can last for long

periods with slow recoveries that can have delayed health impacts (159), such as through

agricultural losses and environmental degradation (47). Increased particulate matter (PM) in

the atmosphere resulting from drought and high winds can also lead to respiratory health

issues and death (10, 29). These conditions can contribute to the spread of pathogens causing

respiratory illnesses (such as coccidioidomycosis and meningitis; see 25, 53). Drought has

also been linked to mental health issues and conflict (59, 173).

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3.3. Floods

Based on the Emergency Events Database, from 1969 to 2018, 10,009 extreme weather

events that resulted in disasters caused over two million deaths and just under four

million cases of disease (83). Floods (47%) and storms (30%) were the most common

extreme weather events worldwide over the period 1969–2018, with an increasing trend

(97). Globally, most direct weather-related deaths were caused by storms (39%), droughts

(34%), and floods (16%). Drowning is the most common cause of death after the onset of

flooding (139). Morbidity continues for more than 10 days after a severe flooding event. A

comprehensive review of the health impacts of worldwide flood and storm disasters between

1985 and 2014 concluded that the health impacts of these extreme events differ (151). The

health impacts include increases and sometimes decreases in

• Injuries, especially wounds, and carbon monoxide and gasoline poisoning after

storms;

• Cases of infectious and parasitic diseases, such as gastrointestinal illness,

respiratory infections, and skin or soft tissue infections, after storms and floods;

• Exacerbations of noncommunicable diseases after storms and floods;

• Increased contact with health services after floods; and

• Cardiopulmonary (floods) and skin complaints (storms and floods).

The results indicate increased needs for emergency and routine health care services.

Differential vulnerabilities increase risks during and after floods and storms. During

Hurricane Harvey (Texas, 2017), physical health problems primarily affected individuals

who did not evacuate. Disparities exist in disaster-related flooding exposure. Older adults

were more likely to live in a household exposed to flooding from Superstorm Sandy (New

York, 2012) (109). Socioeconomic disparities also were present, with poorer residents

having higher risk. Increases in posttraumatic stress disorder (PTSD), depression, and

anxiety are associated with flooding (131, 174) and hurricanes (135). Floods also can

decrease health-related quality of life (149).

Health care access and infrastructure can be severely affected by floods, including loss of

records, impacts on water supplies and laboratory functions, reduced access to health care,

and evacuation, with subsequent consequences for the communities served (21, 139). Health

care access was particularly reduced for persons living in households where someone lost

their job after Hurricane Harvey (50).

3.4. Wildfires

Many parts of the world have seen increases in the length of the wildfire season and

increases in burned area (92). While there are many drivers of these increases (including

historical wildfire suppression and increased intrusion of humans into wildland areas),

climatic changes, including drought, have been implicated as a major contributor to changes

in fire season length and acres burned (1, 179). These trends are projected to continue

under a range of global climate models, with particular agreement among models in the

mid-to-high latitudes (127). Globally, the mortality burden from wildfire smoke is estimated

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to range between 260,000 and 600,000 (90); however, this estimate could now be considered

an underestimate given increases in population globally and increases in extreme wildfires in

North America, Australia, Brazil, and other locations since that study’s publication in 2012.

Wildfire smoke emits a variety of chemicals, including PM (suspended solid and liquid

particles) and gases such as carbon dioxide, carbon monoxide, nitrogen oxides, and volatile

organic compounds. Additionally, many of these chemicals react to form more PM and

ground-level ozone (85). Most studies of the population-health impacts downwind from

wildfires focus on PM10 and PM2.5, as data on these are readily available and there is

a robust literature on the health impacts of these particles. More research is needed to

understand the health impacts of other components of wildfire smoke.

Wildfire smoke exposure is most consistently associated with adverse respiratory health

outcomes (20, 145), with the clearest evidence for exacerbations of asthma whether

measured in hospitalizations, emergency department visits, or physician visits (15, 55,

160). Many studies find that lung function among people with asthma does not decline

with exposure to wildfire smoke (112, 145), but there is some evidence of lung function

decline of nonasthmatics (86, 100). These contradictory findings could be due to higher

medication usage among those with asthma, thus protecting them from exacerbations during

exposure. Many (15, 45) but not all (91) studies that investigate the relationship between

wildfire smoke exposure and refills of rescue medications often used for asthma report

significant positive associations. Associations between wildfire smoke exposure and other

respiratory endpoints are not as consistent, but there is increasing evidence of associations

for exacerbations of COPD and respiratory infections (145).

Wildfire smoke may impact specific cardiovascular endpoints such as out-of-hospital cardiac

arrests (33, 93) and emergency department visits, particularly among the elderly (180).

Studies with sufficient statistical power demonstrate a small but significant increase in

mortality (37, 48, 89, 123). Additionally, there is increased interest in whether wildfire

smoke affects birth outcomes. Babies whose gestation coincided with a wildfire had a

significant but small decline in birth weight (78). An observed decline in birthweight

was significantly associated with wildfire PM2.5 across multiple fire seasons in Colorado,

with increased risk of preterm birth, gestational diabetes, and gestational hypertension (2).

Further, wildfires are associated with adverse mental health (16, 35).

Understanding the populations that are most affected by wildfire smoke exposure is

important for targeting public health adaptations to increased wildfires under a changing

climate, yet very few epidemiological studies have investigated differential risk (104). There

are higher rates of emergency department visits for asthma among females compared to

males (55, 160). Studies investigating differential impacts by age are not consistent except

for studies of asthma exacerbations that showed the highest risks for the elderly, followed

by working age adults, and the lowest risks among children (15). Very few studies have

investigated differential impacts of wildfire smoke by race, ethnicity, or socioeconomic

status (SES) (104, 145), but there is some evidence of stronger associations between

wildfire smoke and visits to the emergency department and hospitalizations in lower-SES

neighborhoods (146).

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Two studies projected the health risks of air pollution from wildfires under climate change,

with one focused on the western United States (115) and the other on the continental United

States (52). The latter study projected that overall PM2.5 concentrations would decrease

owing to decreases in emissions from anthropogenic sources but that fire-related PM2.5

emissions could offset some of these gains in some regions. The net result projected under

high GHG emissions is that fire smoke could be the dominant source of annual average

PM2.5 exposure in all regions by the year 2100. Although PM2.5 mortality is projected to

decrease by 2100, the proportion of deaths due to wildfire-associated PM2.5 could increase

(52).

Wildfires can present many challenges to health systems and impact the operations of

health facilities through increased stress on services, health risks to staff and patients, and

damage to infrastructure and operations (e.g., smoke inundation of hospitals and clinics). In

2017, severe wildfires in the interior region of British Columbia, Canada, affected 19 health

facilities or sites and led to the evacuation of 880 patients, caused the displacement of 700

health professionals, and cost the Interior Health Authority CAN$2.7 million.

3.5. Mental Health

Extreme events and disasters can exacerbate or compound preexisting mental health needs

or trigger new mental ill-health outcomes, acute or chronic and long-term (24). Substantive

socioeconomic implications from destruction to homes, businesses, and communities can

lead to financial stressors and community strain that can increase the likelihood for domestic

or community-based violence (24). At the same time, many people exposed to extreme

events demonstrate resiliency and experience very little to no mental distress (14). People

exposed to extreme events also may experience a mixture of affirmative mental health

outcomes like compassion, growth, and altruism as communities band together in the

wake of a disaster and challenging mental health outcomes like stress, fear, anxiety, and

compassion fatigue (71).

Climate change–related hazards (e.g., drought, sea-level rise, melting permafrost, and

extreme weather events) affect well-being (24, 71). Impacts to mental well-being include

a loss of a sense of place, referred to as solastalgia, and anxiety and grief related to a

changing climate, often referred to as ecoanxiety, climate anxiety, climate trauma, ecogrief,

or climate grief (3, 24, 30). These experiences are often framed as normative responses, so

it is important to look broadly at the full range of mental health outcomes related to climate

change and not to necessarily pathologize these outcomes (70). Those most at risk are those

who already experience health inequities based on the social, environmental, and biological

determinants of health (70).

Enhancing mental health literacy, access to mental health care and culturally relevant care,

and a sense of community, as well as integrating mental health indicators into climate

change and health assessments, support psychosocial adaptation to a changing climate

(70). The cobenefits of climate change mitigation for mental well-being include active

transportation that enhances mood and increased green space that can reduce stress levels

and promote well-being through connections with the natural environment (80).

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4. INCREASING THE RESILIENCE OF HEALTH SYSTEMS

A global adaptation gap exists in efforts by health-sector officials to prepare for climate

hazards such as weather-related disasters (166). Multiple opportunities exist to increase the

climate resiliency of health systems and health facilities (182). Ministries and departments

of health generally have programs with responsibility for managing disaster risks. However,

these programs were developed without explicitly incorporating climate change (e.g.,

considering the implications of projections of future impacts), meaning they may be ill-

equipped to manage the health risks associated with increases in the frequency and intensity

of extreme events. Furthermore, some climate-related hazards, like extreme heat, fall outside

of the official or perceived domains of responsibility for professional disaster management

agencies or are approached through a distributed governance model with no designated

lead entity (68). The key policy levers for health-sector decision makers are climate change

adaptation, GHG mitigation, and disaster risk management. To date, cross-sector adaptation

efforts have been largely incremental, adjusting existing systems while maintaining their

core structure and function. However, given the limitations of these systems to meet the

increasing demands associated with experienced impacts or anticipated climate-related risks,

transformational adaptations that seek to fundamentally change these systems are necessary

(133).

Disaster risk management is often considered separately from adaptation, although there

is growing integration between them to maximize protection of populations and health

systems (8). Successful incorporation of climate change requires developing, implementing,

evaluating, and modifying policies and programs to increase their effectiveness for what will

be a very different future.

4.1. Adaptation and Mitigation

A major focus of adaptation is on promoting development of climate-resilient health systems

(182). Building blocks of such systems include (a) a knowledgeable health workforce with

the tools needed to promote climate resilience; (b) health information systems that support

effective management of the health risks of extreme events; (c) effective service delivery,

including preparation for emergencies; and (d) adequate financing (40). Preparing health

systems for climate extremes and disasters requires robust information about current impacts

and projected risks to inform adaptation planning (182). A critical step is developing

a health national adaptation plan (HNAP) or subnational plan, including conducting a

vulnerability and adaptation assessment (181). An HNAP helps ensure that the health risks

of climate change are prioritized at community to national levels of decision-making to

reduce vulnerabilities and build needed capacity and resilience. The process of developing

an HNAP should be integrated with adaptation planning in other sectors (e.g., disaster risk

management committees, hydro-meteorological services, agriculture, and water) and with

development planning processes (181).

Vulnerability and adaptation assessments should include analyses of the ability of health

systems and services to withstand extreme events and disasters; stress tests can provide

information to officials to facilitate preparing for and managing more severe climate

change–related shocks and stresses (39). The health impacts of extreme events can

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compound until a tipping point is reached, resulting in significant changes in the affected

system and more severe population-health outcomes. This was illustrated in 2017 when

Hurricane Maria resulted in an estimated 4,645 excess deaths in Puerto Rico, with a third of

those deaths from delayed or interrupted health care (101).

Health-sector officials have a wide scope to help reduce the future magnitude and pattern

of extreme weather and climate events through the reduction of GHGs given the large

carbon footprint of health-related activities related to energy, food, anesthetic gases, and

transportation (94). In addition, significant health cobenefits (e.g., better respiratory and

cardiovascular health through improved air quality) that help build resiliency can accrue

through well-designed GHG mitigation efforts (65).

4.2. Disaster Risk Management

Disaster risk management includes “strategies, policies, and measures to improve the

understanding of disaster risk, foster disaster risk reduction and transfer, and promote

continuous improvement in disaster preparedness, response, and recovery practices” (168).

Health-emergency management policies and actions to reduce risks from climate-related

hazards can contribute to adaptation and resiliency-building efforts if they are informed

by climate change considerations and information. Opportunities to integrate disaster risk

management and climate change adaptation include alignment of financing strategies and

mechanisms; development of dual- or multipurpose government policies and strategies;

integration of both disaster risk management and adaptation into national and international

organizations, institutions, and programs; application of widely adopted disaster risk

management participatory hazard assessment approaches; and promotion of locally led

interventions or frameworks that comprehensively address disasters from all hazards and

environmental problems (82). Examples of specific disaster risk management measures that

may concurrently foster climate change adaptation include heat wave warning and response

programs, infrastructure resilience, and overall disaster preparedness (167).

Disaster risk management strategies should consider local context and place emotional

and cognitive experiences and identities that link people to places (13). Place attachment

has both positive and negative relationships with natural environmental risk perception

and risk coping, which have the potential to influence the effectiveness of disaster risk

management strategies (13). For example, strong place attachment is negatively associated

with willingness to evacuate and relocate (13).

Community-based disaster risk management strategies are necessary to address community-

specific risks, integrate priorities for vulnerable groups, and acknowledge community

assets and coping strategies (155). Given the importance of implementing adaptation

measures at the local level, local public health agencies are uniquely positioned to build

resilience (95, 96). Public health actors are well positioned to address climate change

due to their professional responsibilities, experience, and expertise (8). Prior to a disaster,

community-focused public health strategies can reduce climate disaster risk by reducing

human vulnerability (96). Furthermore, public health activities implemented in the context

of disasters—including rapid needs assessments, surveillance, and epidemiologic studies—

will become more important as the frequency of climate-related hazards increases (5).

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An opportunity for state and local health departments to engage in climate change adaptation

activities is to build on existing all-hazards disaster preparedness and response capacity (36).

A key action to close the health adaptation gap related to heat and weather extremes is

to integrate disaster risk management into all health policies and to integrate health into

disaster risk management plans and strategies (166). Additional collaborative opportunities,

partnership, communication (within and across sectors), resources, authority, training, and

capacity for state and local health department engagement in climate change adaptation

activities are necessary (36).

4.3. Economic Considerations

Cross-disciplinary efforts combining population health, economics, and climate to value

the adverse risks of exposures and benefits of adaptation strategies are a priority (83).

While the reported estimates of economic losses associated with extreme weather events

nationally (132) and globally (130) are huge, they provide limited information on the health

impacts. The challenges in attributing health consequences to specific extreme events and/or

variability in meteorological factors (e.g., temperature, precipitation, and humidity) limit

economic valuation.

To assess the direct health costs associated with extreme events, studies used a combination

of cost-of-illness measures (financial costs of utilizing medical care and pharmaceuticals)

and willingness-to-pay-based estimates (e.g., value of statistical life) (147). Studies using

reported medical diagnoses to estimate the changes in morbidity and/or mortality associated

with a sample of climate-sensitive extreme events reported substantial health care costs

(110). A statistical approach to determine the attributable fraction of morbidity and mortality

associated with a specific environmental exposure, mostly extreme temperature (116), can

be used in conjunction with climate and demographic projections to estimate future health

care costs (108). Estimates of the economic burden in these studies are useful in informing

local-level decision-making to prevent adverse outcomes (176).

Extreme temperatures impact health outcomes like labor productivity that have welfare

implications for families, labor wages, and economies (102). Computable general

equilibrium models can assess the economy-wide impacts of future climate scenarios based

on a broader suite of human welfare indicators, such as nutrition (69). There is growing

evidence of the economic impact of hurricanes on hospital evacuations and health care

facilities (163).

In spite of the uncertainty and assumptions around capturing the health benefits and costs

of climate impacts and solutions embedded across different sectors of the economy, these

analyses provide critical inputs to policy decisions (66). The economic perspective is useful

in choosing among alternatives given resource constraints. Coupled with spatially resolved

information on the risk of climate hazards and vulnerable populations, this prioritization

of health interventions could aid public health practitioners in implementing targeted

interventions (120). Complementary to the health cobenefits of adaptation and mitigation

strategies, health interventions related to water and sanitation could have larger societal

benefits (121).

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While the success of efforts to reduce GHGs and avoid increases in extreme weather

events are uncertain, the projected economic benefits of avoided mortality are significant

(169). From an equity perspective, it is important to note that the economic consequences

for specific hurricane-affected communities could be substantial even though the

macroeconomic consequences may appear small in these large-scale assessments of climate

impacts (31).

5. CONCLUSIONS

The coming decades will be characterized by increases in the frequency and intensity of

many types of extreme weather and climate events, with the potential for significant impacts

on populations and health care systems worldwide. Rigorous research conducted before,

during, and after disasters can improve assessments of population health and health system

vulnerabilities and capacities and help evaluate the effectiveness of integrated disaster

risk management and adaptation strategies (126). Such strategies can be cost-effective;

examples include city-level early warning systems (42), community intervention programs

(88), individual-level occupational health interventions (162), and initiatives to build health

facility resilience (72). The evidence base of additional health interventions that can cost-

effectively reduce the health risks of extreme events needs to be expanded.

A major challenge is the mismatch between research needs and the funding priorities of

major health institutions and organizations (142). Overall funding for health adaptation is

negligible (<1% of international climate adaptation finance). This led the 2018 Adaptation

Gap Report to conclude “there is a significant global adaptation gap in health, as efforts

are well below the level required to minimize negative health outcomes” (166, p. XIV).

Research funding to understand and manage the health risks of climate change is even

smaller (41, 62). Underlying reasons include the original framing of climate change as an

environmental problem instead of as a whole-of-society challenge. Although the situation is

changing, there is a tendency for health funders and health systems to continue to consider

climate change as one of many environmental issues, such as nitrogen deposition in our

waterways, where any additional cases of morbidity and mortality could be managed in the

normal course of business by health care and public health institutions. Because the health

risks of a changing climate are not new, funders do not see the need for additional research

and intervention. Climate change is not yet consistently viewed as core to population health

and is not widely considered a current, urgent issue. Another reason funding is so low is

that health funders and institutions take a primarily reductionist, top-down perspective to

health issues, focusing on proximate, individual-level risk factors (125). This medical-model

view of population health has been highly successful in understanding and controlling many

major causes of preventable morbidity and mortality but will be insufficient to protect health

and well-being in the face of the significant social and environmental changes expected

over the coming decades (41). Changing these mindsets through education and capacity

building is vital. Investments in research, adaptation implementation, and evaluation guided

by decision maker needs can increase resilience, helping to protect the most vulnerable

individuals and health care infrastructure while addressing inequities in disaster risk, even as

the climate changes.

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DISCLOSURE STATEMENT

The authors are not aware of any affiliations, memberships, funding, or financial holdings that might be perceived as affecting the objectivity of this review.

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  • Abstract
  • INTRODUCTION
  • EXTREME EVENTS INFLUENCED BY CLIMATE CHANGE
    • Tropical Cyclones or Hurricanes
    • Compound Events
  • POPULATION HEALTH AND HEALTH SYSTEM RISKS FROM EXTREME EVENTS INFLUENCED BY CLIMATE CHANGE
    • High Ambient Temperatures
      • Morbidity and mortality from heat waves.
      • Occupational health.
      • Recreation.
    • Droughts
    • Floods
    • Wildfires
    • Mental Health
  • INCREASING THE RESILIENCE OF HEALTH SYSTEMS
    • Adaptation and Mitigation
    • Disaster Risk Management
    • Economic Considerations
  • CONCLUSIONS
  • References
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