The effects of climate change on human health are increasingly well studied and quantified.[1][2] Rising temperatures and changes in weather patterns are increasing the severity of
heat waves,
extreme weather and other causes of illness, injury or death. Heat waves and extreme weather events have a big impact on health both directly and indirectly. When people are exposed to higher temperatures for longer time periods they might experience
heat illness and
heat-related death.[3]
In addition to direct impacts, climate change and extreme weather events cause changes in the
biosphere. Certain diseases that are carried by
vectors or spread by climate-sensitive
pathogens may become more common in some regions. Examples include
mosquito-borne diseases such as
dengue fever, and
waterborne diseases such as
diarrhoeal disease.[3][4] Climate change will impact where infectious diseases are able to spread in the future. Many infectious diseases will spread to new geographic areas where people have not previously been exposed to them.[5][6]
Climate change affects human health at all ages, from infancy through adolescence, adulthood and old age.[7][3] Factors such as age, gender and
socioeconomic status influence to what extent these effects become wide-spread risks to human health.[8]: 1867 Extreme weather creates
climate hazards for whole families, particularly those headed by women. It can also reduce the earning capacity and economic stability of people. Populations over 65 years of age are particularly vulnerable to heat and other health effects of climate change.[7] Health risks are unevenly distributed across the world.[8] Disadvantaged people are particularly
vulnerable to climate change.[3]: 15
The health effects of climate change are increasingly a matter of concern for the international public health policy community. In 2009, a publication in the general medical journal The Lancet stated that "Climate change is the biggest global health threat of the 21st century".[9] The
World Health Organization reiterated this in 2015.[10]
Research shows that health professionals around the world agree that climate change is real, is caused by humans, and is causing increased health problems in their communities. Studies also show that taking action to address climate change improves public health. Health professionals can act by informing people about health harms and ways to address them, by lobbying leaders to take action, and by taking steps to decarbonize their own homes and workplaces.[11]
Studies have found that communications on climate change that present it as a health concern rather than just an environmental matter are more likely to engage the public.[12][13]
Overview of health effects and pathways
The effects of climate change on human health can be grouped into direct and indirect effects.[8]: 1867 Both types of effects interact with social dynamics. The combination of effects and social dynamics determines the eventual health outcomes. Mechanisms and social dynamics are explained further below:
Direct mechanisms or risks: changes in extreme weather and resultant increased storms, floods, droughts, heat waves and wildfires[3]
Indirect mechanisms or risks: these are mediated through changes in the
biosphere (e.g., the burden of disease and redistribution of disease vectors, or food availability,
water quality,
air pollution,
land use change, ecological change)
These health risks vary across the world and between different groups of people. For example, differences in health service provision or economic development will result in different health risks for people in different regions, with less developed countries facing greater health risks. In many places, the combination of lower socioeconomic status and cultural gender roles result in increased health risks to women and girls as a result of climate change, compared to those faced by men and boys (although the converse may apply in other instances).[8]
Health and
health care provision can also be impacted by the collapse of
health systems and damage to infrastructure due to climate-induced events such as flooding. Therefore, building health systems that are
climate resilient is a priority.[14][3]: 15
Impact of higher
global temperatures will have ramifications for the following aspects: vulnerability to extremes of heat, exposure of vulnerable populations to
heatwaves, heat and physical activity, change in labor capacity, heat and sentiment (mental health), heat-related mortality.[3]
The global average and combined land and
ocean surface temperature show a warming of 1.09 °C (range: 0.95 to 1.20 °C) from 1850–1900 to 2011–2020, based on multiple independently produced datasets.[15] The trend is faster since the 1970s than in any other 50-year period over at least the last 2000 years.[15]
A 2023 study estimated that climate change since 1960–1990 has put over 600 million people (9% of the global population) outside the "temperature niche" - the average temperature range at which humans flourish.[16]
A 2020 study projects that regions inhabited by a third of the human population could become as hot as the hottest parts of the
Sahara within 50 years without a
change in patterns of population growth and without
migration, unless
greenhouse gas emissions are reduced. The projected annual average temperature of above 29 °C for these regions would be outside the "human temperature niche" – a suggested range for climate biologically suitable for humans based on historical data of mean annual temperatures (MAT) – and the most affected regions have little
adaptive capacity as of 2020.[17][18] The UK
Met Office came to similar conclusions, reporting that the "numbers of people in regions across the world affected by extreme heat stress – a potentially fatal combination of heat and humidity – could increase" "from 68 million today to around one billion" if the world's temperature rise reaches 2°C,[19] albeit it is unclear if that limit or the 1.5 °C goal of the
Paris Agreement is achieved.
Vulnerable people with regard to
heat illnesses include people with low incomes, minority groups, women (in particular pregnant women), children, older adults (over 65 years old), people with chronic diseases, disabilities and
co-morbidities.[3]: 13 Other people at risk include those in urban environments (due to the
urban heat island effect), outdoor workers and people who take certain
prescription drugs.[3] Exposure to extreme heat poses an acute health hazard for many of the people deemed as vulnerable.[3][21]
Climate change increases the frequency and severity of heatwaves and thus
heat stress for people. Human responses to heat stress can include
heat stroke and
hyperthermia. Extreme heat is also linked to low quality
sleep,
acute kidney injury and complications with
pregnancy. Furthermore, it may cause the deterioration of pre-existing
cardiovascular and
respiratory disease.[2]: 1624 Adverse pregnancy outcomes due to high ambient temperatures include for example
low birth weight and
pre-term birth.[2]: 1051 Heat waves have also resulted in epidemics of
chronic kidney disease (CKD).[22][23] Prolonged heat exposure, physical exertion, and dehydration are sufficient factors for the development of CKD.[22][23]
The human body requires evaporative cooling to prevent overheating, even with a low activity level. With excessive ambient heat and humidity during
heatwaves, adequate evaporative cooling might be compromised.
A
wet-bulb temperature that is too high means that human bodies would no longer be able to adequately cool the skin.[24][25] A wet bulb temperature of 35 °C is regarded as the limit for humans (called the "physiological threshold for human adaptability" to heat and humidity).[26]: 1498 As of 2020, only two weather stations had recorded 35 °C wet-bulb temperatures, and only very briefly, but the frequency and duration of these events is expected to rise with ongoing climate change.[27][28][29] Global warming above 1.5 degrees risks making parts of the
tropics uninhabitable because the threshold for the wet bulb temperature may be passed.[24]
Further study found that even a wet bulb temperature of 31 degrees is dangerous, even for young and healthy people. This threshold is not uniform for all and depend on many factors including environmental factors, activity and age. If the global temperature will rise by 3 degrees (the most likely scenario if things will not change), temperatures will exceed this limit at large areas in Pakistan, India, China, Sub Saharan Africa, United States, Australia, South America.[30]
People with cognitive health issues (e.g.
depression,
dementia,
Parkinson's disease) are more at risk when faced with high temperatures and ought to be extra careful[31] as cognitive performance has been shown to be differentially affected by heat.[32] People with diabetes and those who are overweight, have sleep deprivation, or have cardiovascular/cerebrovascular conditions should avoid too much heat exposure.[31][33]
The risk of dying from chronic lung disease during a heat wave has been estimated at 1.8-8.2% higher compared to average summer temperatures.[34] An 8% increase in hospitalization rate for people with
Chronic Obstructive Pulmunary Disease has been estimated for every 1 °C increase in temperatures above 29 °C.[21]
The effects of heatwaves tend to be more pronounced in urban areas because they are typically warmer than surrounding rural areas due to the
urban heat island effect.[35][36]: 2926 This is caused from the way many cities are built. For example, they often have extensive areas of asphalt, reduced greenery along with many large heat-retaining buildings that physically block cooling breezes and ventilation.[21] Lack of water features are another cause.[36]: 2926
Extreme heat exposure in cities with a
wet bulb globe temperature above 30 °C tripled between 1983 and 2016.[35] It increased by about 50% when the population growth in these cities is not taken into account.[35]
Cities are often on the front-line of climate change due to their densely concentrated populations, the urban heat island effect, their frequent proximity to coasts and waterways, and reliance on ageing physical infrastructure networks.[37]
Heat-related mortality
Health experts warn that "exposure to extreme heat increases the risk of death from
cardiovascular,
cerebrovascular, and
respiratory conditions and all-cause mortality. Heat-related deaths in people older than 65 years reached a record high of an estimated 345 000 deaths in 2019".[3]: 9 More than 70,000 Europeans died as a result of the
2003 European heat wave.[38] Also more than 2,000 people died in
Karachi, Pakistan in June 2015 due to a severe heat wave with temperatures as high as 49 °C (120 °F).[39][40]
Mortality due to heat waves could be reduced if buildings were better designed to modify the internal climate, or if the occupants were better educated about the issues, so they can take action on time.[41][42] Heatwave early warning and response systems are important elements of heat action plans.
Reduced labour capacity
Heat exposure can affect people's ability to work.[3]: 8 The annual Countdown Report by
The Lancet investigated change in labour capacity as an indicator. It found that during 2021, high temperature reduced global potential labour hours by 470 billion - a 37% increase compared to the average annual loss that occurred during the 1990s. Occupational heat exposure especially affects laborers in the agricultural sector of
developing countries. In those countries, the vast majority of these labour hour losses (87%) were in the agricultural sector.[2]: 1625
Working in extreme heat can lead to labor force productivity decreases as well as participation because employees' health may be weaker due to heat related health problems, such as dehydration, fatigue, dizziness, and confusion.[43][1]: 1073–1074
Sports and outdoor exercise
With regards to sporting activities, it has been observed that "hot weather reduces the likelihood of engaging in exercise".[2]: 1625 Furthermore, participating in sports during excessive heat can lead to injury or even death.[1]: 1073–1074 It is also well established that regular physical activity is beneficial for human health, including mental health.[2]: 1625 Therefore, an increase in hot days due to climate change could indirectly affect health due to people exercising less.
Health risks from other weather and climate events
Climate change is increasing the periodicity and intensity of some
extreme weather events.[44] Confidence in the
attribution of extreme weather to anthropogenic climate change is highest in changes in frequency or magnitude of extreme heat and cold events with some confidence in increases in heavy precipitation and increases in the intensity of droughts.[45]
Extreme weather events, such as floods, hurricanes, droughts and wildfires can result in injuries, death and the spread of
infectious diseases. For example, local
epidemics can occur due to loss of infrastructure, such as hospitals and
sanitation services, but also because of changes in local ecology and environment.
Examples include:
Droughts and health effects: Climate change affects multiple factors associated with
droughts, such as how much rain falls and how fast the rain
evaporates again. Warming over land increases the severity and frequency of droughts around much of the world.[46][47]: 1057 Many of the
consequences of droughts have effects on human health.
Floods and health effects: Due to an increase in heavy rainfall events,
floods are expected to become more severe in the future when they do occur.[47]: 1155 However, the interactions between rainfall and flooding are complex. In some regions, flooding is expected to become rarer. This depends on several factors, such as changes in rain and snowmelt, but also
soil moisture.[47]: 1156 Floods have short and long-term negative implications to people's health and well-being. Short term implications include
mortalities,
injuries and
diseases, while long term implications include
non-communicable diseases and
psychosocial health aspects.[48] For example, the
2022 Pakistan Floods (which were likely more severe because of climate change[49][50]) affected people's health directly and indirectly. There were outbreaks of diseases like malaria, dengue, and other skin diseases.[51][52]
Storms become wetter under climate change. These include
tropical cyclones and
extratropical cyclones. Both the maximum and mean rainfall rates increase. This more extreme rainfall is also true for
thunderstorms in some regions.[56] Furthermore, tropical cyclones and storm tracks are moving towards the poles. This means some regions will see large changes in maximum wind speeds.[56][57] Scientists expect there will be fewer tropical cyclones. But they expect their strength to increase.[57] (see
effects of climate change#Extreme storms and
tropical cyclones and climate change)
Health risks from climate-sensitive infectious diseases
Infectious diseases that are sensitive to climate can be grouped into: vector-borne diseases (transmitted via
mosquitos,
ticks etc.), waterborne diseases (transmitted via viruses or bacteria through water), and food-borne diseases.[60]: 1107 Climate change is affecting the distribution of these diseases due to the expanding geographic range and seasonality of these diseases and their vectors.[61]: 9 Like other ways in which climate change affects on human health, climate change exacerbates existing inequalities and challenges in managing infectious disease.
Mosquito-borne diseases that are sensitive to climate include
malaria,
lymphatic filariasis,
Rift Valley fever,
yellow fever, dengue fever,
Zika virus, and
chikungunya.[62][63][64] Scientists found in 2022 that rising temperatures are increasing the areas where dengue fever, malaria and other mosquito-carried diseases are able to spread.[60]: 1062 Warmer temperatures are also advancing to higher elevations, allowing mosquitoes to survive in places that were previously inhospitable to them.[60]: 1045 This risks malaria making a return to areas where it was previously eradicated.[65]
Climate change affects many aspects of
food security through "multiple and interconnected pathways".[2]: 1619 Many of these are related to the
effects of climate change on agriculture, for example failed crops due to more extreme weather events. This comes on top of other coexisting crises that reduce food security in many regions. Less food security means more
undernutrition with all its associated health problems. Food insecurity is increasing at the global level (some of the underlying causes are related to climate change, others are not) and about 720–811 million people suffered from hunger in 2020.[2]: 1629
The number of deaths resulting from climate change-induced changes to food availability are difficult to estimate. The 2022
IPCC Sixth Assessment Report does not quantify this number in its chapter on food security.[66] A modelling study from 2016 found "a climate change–associated net increase of 529,000 adult deaths worldwide [...] from expected reductions in food availability (particularly fruit and vegetables) by 2050, as compared with a reference scenario without climate change."[67][68]
A headline finding in 2021 regarding marine food security stated that: "In 2018–20, nearly 70% of countries showed increases in average sea surface temperature in their territorial waters compared within 2003–05, reflecting an increasing threat to their marine food productivity and marine food security".[3]: 14 (see also
climate change and fisheries).
The
effects of climate change on mental health and wellbeing are documented. This is especially the case for vulnerable populations and those with pre-existing serious
mental illness.[69] There are three broad pathways by which these effects can take place: directly, indirectly or via awareness.[70] The direct pathway includes stress-related conditions caused by exposure to
extreme weather events. These include
post-traumatic stress disorder (PTSD). Scientific studies have linked mental health to several climate-related exposures. These include heat, humidity, rainfall, drought, wildfires and floods.[71] The indirect pathway can be disruption to economic and social activities. An example is when an area of farmland is less able to produce food.[71] The third pathway can be of mere awareness of the climate change threat, even by individuals who are not otherwise affected by it.[70]
Pollen allergies
A warming climate can lead to increases of pollen
season lengths and concentrations in some regions of the world. For example, in northern mid-latitudes regions, the spring pollen season is now starting earlier.[1]: 1049 This can affect people with
pollen allergies (hay fever).[72] The rise in pollen also comes from
rising CO2 concentrations in the atmosphere and resulting
CO2 fertilisation effects.[1]: 1096
The relationship between surface ozone (also called
ground-level ozone) and ambient temperature is complex. Changes in air temperature and water content affect the air's chemistry and the rates of chemical reactions that create and remove ozone. Many chemical reaction rates increase with temperature and lead to increased ozone production. Climate change projections show that rising temperatures and water vapour in the atmosphere will likely increase surface ozone in polluted areas like the eastern United States.[73]
On the other hand, ozone concentrations could decrease in a warming climate if anthropogenic ozone-precursor emissions (e.g., nitrogen oxides) continue to decrease through implementation of policies and practices.[74] Therefore, future surface ozone concentrations depend on the climate change mitigation steps taken (more or less methane emissions) as well as air pollution control steps taken.[75]: 884
High surface ozone concentrations often occur during heat waves in the United States.[74] Throughout much of the eastern United States, ozone concentrations during heat waves are at least 20% higher than the summer average.[74] Broadly speaking, surface ozone levels are higher in cities with high levels of air pollution.[75]: 876 Ozone pollution in urban areas affects denser populations, and is worsened by high populations of vehicles, which emit pollutants NO2 and
VOCs, the main contributors to problematic ozone levels.[76]
There is a great deal of evidence to show that surface ozone can harm lung function and irritate the
respiratory system.[77][78] Exposure to ozone (and the pollutants that produce it) is linked to premature
death,
asthma,
bronchitis,
heart attack, and other cardiopulmonary problems.[79][80] High ozone concentrations irritate the lungs and thus affect respiratory function, especially among people with asthma.[74] People who are most at risk from breathing in ozone air pollution are those with respiratory issues, children, older adults and those who typically spend long periods of time outside such as construction workers.[81]
Changes in atmospheric
carbon dioxide may reduce the
nutritional quality of some crops, with for instance wheat having less protein and less of some minerals.[84]: 439 [85] The nutritional quality of
C3 plants (e.g. wheat, oats, rice) is especially at risk: lower levels of protein as well as minerals (for example zinc and iron) are expected.[86]: 1379 Food crops could see a reduction of
protein,
iron and
zinc content in common food crops of 3 to 17%.[87] This is the projected result of food grown under the expected atmospheric carbon-dioxide levels of 2050. Using data from the
UN Food and Agriculture Organization as well as other public sources, the authors analyzed 225 different staple foods, such as
wheat,
rice,
maize,
vegetables, roots and
fruits.[88]
The warming oceans and lakes are leading to more frequent
harmful algal blooms.[89][90][91] Also, during droughts, surface waters are even more susceptible to harmful algal blooms and microorganisms.[92] Algal blooms increase water turbidity, suffocating aquatic plants, and can deplete oxygen, killing fish. Some kinds of
blue-green algae (cyanobacteria) create
neurotoxins, hepatoxins, cytotoxins or endotoxins that can cause serious and sometimes fatal neurological, liver and digestive diseases in humans. Cyanobacteria grow best in warmer temperatures (especially above 25 degrees Celsius), and so areas of the world that are experiencing general warming as a result of climate change are also experiencing harmful algal blooms more frequently and for longer periods of time.[93]
It is possible that a potential health benefit from global warming could result from fewer cold days in winter:[1]: 1099 This could lead to some mental health benefits. However, the evidence on this correlation is regarded as inconsistent in 2022.[1]: 1099
Benefits from climate change mitigation and adaptation
The potential health benefits (also called "co-benefits") from
climate change mitigation and
adaptation measures are significant, having been described as "the greatest global health opportunity" of the 21st century. [8]: 1861 Measures can not only mitigate future health effects from climate change but also improve health directly.[96] Climate change mitigation is interconnected with various co-benefits (such as reduced
air pollution and associated health benefits)[97] and how it is carried out (in terms of e.g. policymaking) could also determine its effect on living standards (whether and how inequality and poverty are reduced).[98]
There are many health co-benefits associated with climate action. These include those of cleaner air, healthier diets (e.g. less red meat), more
active lifestyles, and increased exposure to green urban spaces.[3]: 26 Access to urban green spaces provides benefits to mental health as well.[3]: 18
Biking reduces
greenhouse gas emissions[99] while reducing the effects of a
sedentary lifestyle at the same time[100] According to PLoS Medicine: "obesity, diabetes, heart disease, and cancer, which are in part related to physical inactivity, may be reduced by a switch to low-carbon transport—including walking and cycling."[101]
Compared with the
current pathways scenario (with regards to greenhouse gas emissions and mitigation efforts), the sustainable pathways scenario will likely result in an annual reduction of 1.18 million air pollution-related deaths, 5.86 million diet-related deaths, and 1.15 million deaths due to physical inactivity, across the nine countries, by 2040. These benefits were attributable to the mitigation of direct greenhouse gas emissions and the commensurate actions that reduce exposure to harmful pollutants, as well as improved diets and safe physical activity.[102]
Climate change mitigation policies can lead to lower emissions of co-emitted air pollutants, for instance by shifting away from fossil fuel combustion. Gases such as
black carbon and methane contribute both to global warming and to air pollution. Their mitigation can bring benefits in terms of limiting global temperature increases as well as improving air quality.[105] Implementation of the climate pledges made in the run-up to the
Paris Agreement could therefore have significant benefits for human health by improving air quality.[106] The replacement of coal-based energy with renewables can lower the number of premature deaths caused by air pollution. A higher share of renewable energy and consequently less coal-related respiratory diseases can decrease health costs.[107]
Global estimates
Estimating deaths (
mortality) or
DALYs (
morbidity) from the effects of climate change at the global level is very difficult. A 2014 study by the
World Health Organization estimated the effect of climate change on human health, but not all of the
effects of climate change were included.[109] For example, the effects of more frequent and extreme storms were excluded. The study assessed deaths from heat exposure in elderly people, increases in
diarrhea, malaria, dengue,
coastal flooding, and childhood undernutrition. The authors estimated that climate change was projected to cause an additional 250,000 deaths per year between 2030 and 2050 but also stated that "these numbers do not represent a prediction of the overall impacts of climate change on health, since we could not quantify several important causal pathways".[109]
Climate change was responsible for 3% of
diarrhoea, 3% of
malaria, and 3.8% of
dengue fever deaths worldwide in 2004.[110] Total attributable mortality was about 0.2% of deaths in 2004; of these, 85% were child deaths. The effects of more frequent and extreme storms were excluded from this study.
The health effects of climate change are expected to rise in line with projected ongoing global warming for different
climate change scenarios.[111][112] A review[113] found if warming reaches or exceeds 2 °C this century, roughly 1 billion premature deaths would be caused by anthropogenic global warming.[114]
A 2021 report published in The Lancet found that climate change does not affect people's health in an equal way. The greatest impact tends to fall on the most vulnerable such as the poor, women, children, the elderly, people with pre-existing health concerns, other minorities and outdoor workers.[3]: 13
The social vulnerability of people is related to certain health patterns. For example there are "demographic, socioeconomic, housing, health (such as pre-existing health conditions), neighbourhood, and geographical factors".[115]
Much of the health burden associated with climate change falls on vulnerable people (e.g.
indigenous peoples and economically disadvantaged communities). As a result, people of disadvantaged sociodemographic groups experience unequal risks.[116] Often these people will have made a disproportionately low contribution toward man-made global warming, thus leading to concerns over
climate justice.[117][118][112]
Climate change has diverse effects on migration activities, and can lead to decreases or increases in the number of people who migrate.[1]: 1079 Migration activities can have an effect on health and well-being, in particular for
mental health. Migration in the context of climate change can be grouped into four types: adaptive migration (see also
climate change adaptation), involuntary migration, organised relocation of populations, and immobility (which is when people are unable or unwilling to move even though it is recommended).[1]: 1079
The observed contribution of climate change to conflict risk is small in comparison with cultural, socioeconomic, and political causes. There is some evidence that
rural-to-urban migration within countries worsens the conflict risk in violence prone regions. But there is no evidence that migration between countries would increase the risk of violence.[1]: 1008, 1128
Studies have found that when
communicating climate change with the public, it can help encourage engagement if it is framed as a health concern, rather than as an environmental issue. This is especially the case when comparing a health related framing to one that emphasised environmental doom, as was common in the media at least up until 2017.[119][120] Communicating the co-benefits to health helps underpin
greenhouse gas reduction strategies.[37] Safeguarding health—particularly of the most vulnerable—is a frontline local
climate change adaptation goal.[37]
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