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. 2015 Jul 15;12(7):8034-74.
doi: 10.3390/ijerph120708034.

Limitations to Thermoregulation and Acclimatization Challenge Human Adaptation to Global Warming

Elizabeth G Hanna  1 , Peter W Tait  2
Affiliations

Limitations to Thermoregulation and Acclimatization Challenge Human Adaptation to Global Warming

Elizabeth G Hanna et al. Int J Environ Res Public Health. .

Abstract

Human thermoregulation and acclimatization are core components of the human coping mechanism for withstanding variations in environmental heat exposure. Amidst growing recognition that curtailing global warming to less than two degrees is becoming increasing improbable, human survival will require increasing reliance on these mechanisms. The projected several fold increase in extreme heat events suggests we need to recalibrate health protection policies and ratchet up adaptation efforts. Climate researchers, epidemiologists, and policy makers engaged in climate change adaptation and health protection are not commonly drawn from heat physiology backgrounds. Injecting a scholarly consideration of physiological limitations to human heat tolerance into the adaptation and policy literature allows for a broader understanding of heat health risks to support effective human adaptation and adaptation planning. This paper details the physiological and external environmental factors that determine human thermoregulation and acclimatization. We present a model to illustrate the interrelationship between elements that modulate the physiological process of thermoregulation. Limitations inherent in these processes, and the constraints imposed by differing exposure levels, and thermal comfort seeking on achieving acclimatization, are then described. Combined, these limitations will restrict the likely contribution that acclimatization can play in future human adaptation to global warming. We postulate that behavioral and technological adaptations will need to become the dominant means for human individual and societal adaptations as global warming progresses.

Keywords: acclimatization; climate change; climate change adaptation; extreme heat; health risks; heat physiology; heat policy; limits; thermal comfort; thermoregulation.

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Figures

Figure 1
Figure 1
Thermoregulation Model. This model depicts human body heat flows showing the interrelationship of the physiological and external factors that influence thermoregulation.
Figure 1
Figure 1
Thermoregulation Model. This model depicts human body heat flows showing the interrelationship of the physiological and external factors that influence thermoregulation.
Figure 2
Figure 2
Acclimatization Continuum showing population distribution through three levels, and blurring between groups.
See this image and copyright information in PMC

References

    1. NOAA National Climatic Data Center (U.S.) Global Analysis—Annual 2014. National Oceanic and Atmospheric Administration; Asheville, NC, USA: 2015.
    1. The Global Climate 2001–2010. A Decade of Weather Extremes. World Meteorological Organsiation; Geneva, Switzerland: 2012. p. 61.
    2. Coumou D., Rahmstorf S. A Decade of Weather Extremes. Nat.Clim. Chang. 2012;2:491–496.
    1. Warming Trend Continues in 2014 Hottest Year on Record. World Meteorological Organization; Geneva, Switzerland: 2015.
    1. Kokic P., Crimp S., Howden M. A probabilistic analysis of human influence on recent record global mean temperature changes. Clim. Risk Manag. 2014;3:1–12. doi: 10.1016/j.crm.2014.03.002. - DOI
    1. Climate Change 2013: The Physical Science Basis. Intergovernmental Panel on Climate Change (IPCC); Geneva, Switzerland: 2013.

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