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Last Update: 10/26/2026 at 11:33 PM EST
Extreme Heat and Human Health
Coverage from Mercury News, Sustainable Energy for All, and others
Extreme heat and humidity can overwhelm the body’s ability to cool itself, causing heat illness and contributing to cardiovascular, respiratory, and kidney problems.
Heat that persists overnight can interrupt sleep and recovery, while indoor spaces may remain dangerous during outages or when homes lack effective cooling. Health burdens are uneven: older adults, children, people with chronic conditions, outdoor workers, and households with limited cooling access can face greater exposure. Research ranging from heat-livability models to studies of indoor temperatures helps explain these risks and informs adaptation such as shade, improved ventilation, cooling access, and heat-aware work practices.
Looking Back
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History
10/03/2026
The story now adds evidence of worsening heat stress since the 1970s and documented mortality impacts from recent heatwaves, shifting emphasis beyond projected risks to observed consequences.
All Articles56 articles
Important
Stanford University researchers projected that older adults worldwide will face substantially greater exposure to uncompensable heat as warming and population aging intensify, especially in South Asia and the Arabian Peninsula.
8/31/2026 • Climate Science & Impacts • General
The 2025 Lancet Countdown reported rising global heat mortality and identified African and lower-income countries as facing severe future risks from increasing temperatures.
8/23/2026 • Climate Science & Impacts • General
UK adults reported major sleep difficulty during a June western Europe heat wave, linked by attribution to human-caused nighttime warming.
7/21/2026 • Climate Science & Impacts • General
KAIST researchers project that future warming will increase temperature-related suicide mortality in 26 countries, with regional differences in risk magnitude.
7/14/2026 • Climate Science & Impacts • General
Imperial College London, Met Office, and London School of Hygiene and Tropical Medicine estimated at least 2,700 excess deaths in England and Wales from May and June heatwaves, with climate change contributing extra heat.
7/13/2026 • Climate Science & Impacts • General
Yale researchers in the U.S. report a gap between CDC Heat and Health Index risk assessments and public concern amid rising extreme-heat exposure.
7/13/2026 • Climate Science & Impacts • General
University of Chicago Climate Impact Lab researchers project 2050 heat deaths of 391,000 per year in poorer countries versus 39,000 in richer countries under 2.1C warming.
5/29/2026 • Climate Science & Impacts • General
Luke Parsons and colleagues used the HEAT-Lim model to estimate age-specific outdoor livability limits from 1950 to 2024, finding severe impacts concentrated in tropical and warm regions.
3/29/2026 • Climate Science & Impacts • General
Extreme heat risk is increasing globally and in the United States, with climate change driving more frequent, severe heat waves and health impacts.
7/9/2026 • Climate Science & Impacts • General
Heatwaves in Europe during 2022 have intensified as warming increases nighttime heat stress, raising health impacts and deaths across multiple countries.
7/7/2026 • Climate Science & Impacts • General
Rebecca Emerton and collaborators report Nature Climate Change results showing expanding heat stress and more dangerous humid extremes across Mexico, Kenya, and southern Europe over six decades.
6/22/2026 • Climate Science & Impacts • General
Nature Communications researchers reanalyzed six heatwaves from 2003 to 2024 and found potentially lethal outdoor conditions for people over 65 in Mecca, Bangkok, Phoenix, Mount Isa, Larkana, and Seville.
4/8/2026 • Climate Science & Impacts • General
On October 9, Penn State and Purdue researchers reported in Proceedings of the National Academy of Sciences that additional warming could regularly expose billions worldwide to heat and humidity beyond human tolerance thresholds.
10/9/2023 • Climate Science & Impacts • General
During the June 2026 Western Europe heatwave, London and other cities are urged to use local heat-risk data and targeted cooling to reduce heat-related deaths.
6/30/2026 • Adaptation & Resilience • General
Austin home simulations estimate that heat waves with power outages can create lethal indoor conditions, with risk for healthy adults rising under future warming.
6/26/2026 • Adaptation & Resilience • General
The Congressional Budget Office projects that U.S. climate adaptation will prevent 2.5 million temperature-related Medicare deaths through 2075 while increasing emergency-department visits.
9/16/2026 • Climate Science & Impacts • General
Climate Impact Lab researchers estimate that climate-driven heat could cause 430,000 additional annual deaths worldwide by 2050, especially in poorer countries across sub-Saharan Africa and South Asia.
8/2/2026 • Climate Science & Impacts • General
Climate Central reported human-caused climate change is increasing dangerous humid heat days in global cities, with wet-bulb temperatures defining hazardous conditions.
6/24/2026 • Climate Science & Impacts • General
ECMWF-linked research using Universal Thermal Climate Index reports greater hazardous heat stress in the Arabian Peninsula since the 1970s, with health risks rising under continued emissions.
6/23/2026 • Climate Science & Impacts • General
A March Nature Ecology and Evolution study linked climate-amplified heat waves to biodiversity harm during a 2021 western North America extreme heat event.
6/19/2026 • Climate Science & Impacts • General
ERA5 and LandScan analysis of MENA from 1951 to 2020 finds rising WBGT, fewer normal days, and more extreme heat-stress exposure, especially in Saudi Arabia.
6/14/2026 • Climate Science & Impacts • General
Kaitlyn Trudeau and researchers at Climate Central report rising heat-index humid days in the Midwest and South, increasing heat-health risks for outdoor laborers.
6/8/2026 • Climate Science & Impacts • General
Researchers model heat-attributable cardiovascular disease burden in the USA, projecting a threefold increase by 2050 under a high greenhouse gas scenario.
6/8/2026 • Climate Science & Impacts • General
Researchers project rising heat exposure will more than triple heat-attributable cardiovascular disease burden in the USA by 2050 under high emissions, affecting older adults and disadvantaged communities.
6/6/2026 • Climate Science & Impacts • General
Researchers project through 2050 higher heat-related heart disease burden across U.S. counties, with larger impacts expected in lower-income areas and the South.
5/28/2026 • Climate Science & Impacts • General
Researchers in the United States mapped county-level projections for heat-related heart disease burden through 2050 using Global Burden of Disease, NASA temperature modeling, and U.S. Census data.
5/27/2026 • Climate Science & Impacts • General
Researchers linked 2013-2019 ambulance dispatch data from 13 Chinese cities to higher seven-day health risk during compound temperature-humidity extremes.
4/19/2026 • Climate Science & Impacts • General
Researchers warn that rising heat and humidity reduce safe activity worldwide, with vulnerable populations facing higher risk due to uneven cooling access.
3/18/2026 • Climate Science & Impacts • General
Lancet Global Health study links rising heat to increased adult physical inactivity globally, 2000-2022
3/16/2026 • Climate Science & Impacts • General
In studies across India, the United States, China, Germany, Sweden, and Portugal, repeated extreme heat exposure correlated with inflammation biomarkers tied to cardiovascular risk.
7/21/2026 • Climate Science & Impacts • General
Outdoor workers face greater dehydration and health risks as extreme heat events rise, affecting kidney function and productivity in India, Guatemala, and North Carolina.
7/1/2026 • Climate Science & Impacts • General
University of Sydney-led research finds extreme temperatures in New South Wales increase hospital admissions for youth mental health conditions, with risk doubling in warm months.
7/6/2026 • Climate Science & Impacts • General
A U.S. heat dome is keeping overnight temperatures abnormally warm during heat waves, raising heat exhaustion and heat stroke risk especially where air conditioning access is limited.
7/2/2026 • Climate Science & Impacts • General
Rebecca Emerton of the European Centre for Medium-Range Weather Forecasts reported a Nature Climate Change study showing rising global heat stress and hot nights from the 1970s to 2024.
6/23/2026 • Climate Science & Impacts • General
From 2010-2016 county data, a U.S. team projects higher heat-related heart disease risk through 2050, especially in lower-income states.
5/27/2026 • Climate Science & Impacts • General
Economist Derek Lemoine projects that better day-ahead hot-temperature forecasts could reduce U.S. heat deaths by 18% to 25% by 2100.
4/13/2026 • Climate Science & Impacts • General
Researchers report that rising heat now increases physical inactivity worldwide, with greater effects in low and middle income regions.
3/16/2026 • Climate Science & Impacts • General
In late January 2026, medical experts in Australia detailed how near-50C heat in Victoria and South Australia endangers cardiovascular health and increases mortality.
1/27/2026 • Climate Science & Impacts • General
In a new global study, Stanford University researchers found that older adults face dangerous heat stress at lower temperatures as climate warming intensifies heat exposure.
8/19/2026 • Climate Science & Impacts • General
Stanford University researchers found that older adults worldwide face dangerous heat stress at lower temperatures as climate warming increases the frequency and duration of heatwaves.
8/17/2026 • Climate Science & Impacts • General
Interesting
Climate Impact Lab reports that poor, hot countries face high extreme heat mortality risks by 2050 due to limited electricity for cooling.
7/27/2026 • Climate Science & Impacts • General
June 2021 Pacific Northwest heat dome in British Columbia caused record temperatures, more than 600 deaths, and health risks tied to ozone formation and overheating.
6/2/2026 • Climate Science & Impacts • General
Researchers project that under current climate policy trajectories, simultaneous extreme heat and drought exposure could rise to about 2.6 billion people by the 2090s.
4/7/2026 • Climate Science & Impacts • General
Climate Impact Lab projections estimate extreme heat will cause about 391,000 annual deaths in lower-income countries versus about 39,000 in higher-income countries.
3/26/2026 • Climate Science & Impacts • General
Climate Impact Lab researchers released an Adaptation Roadmap report projecting by 2050 the greatest heat mortality burdens in hotter, lower-income regions and cities, including Burkina Faso and Faisalabad.
3/25/2026 • Climate Science & Impacts • General
As climate warming raises heat exposure, Jessica Murfree warns that young athletes in urban and low-income communities face heightened heat-illness risks during outdoor sports practices.
7/31/2026 • Climate Science & Impacts • General
Michael Rawlins and Steven Cohen describe a Fourth of July heat dome over the U.S. Midwest and Atlantic coast as a preview of hotter, longer extreme-heat conditions.
7/6/2026 • Climate Science & Impacts • General
Climate Impact Lab projects increased heat-related mortality by 2050 across the Sahel and Pakistan, emphasizing unequal risk for lower-income regions and cities.
3/25/2026 • Climate Science & Impacts • General
A Lancet Global Health analysis projects hotter temperatures will increase physical inactivity by 2050, driving additional deaths and productivity losses, especially in low-income countries.
3/23/2026 • Climate Science & Impacts • General
Researchers project global physical inactivity rising by 2050 due to heat, with adaptive measures improving health and urban livability worldwide.
3/17/2026 • Climate Science & Impacts • General
International Labour Organization data indicate extreme heat exposure endangers outdoor workers worldwide, while many US states lack enforceable occupational heat standards.
6/30/2026 • Climate Science & Impacts • General
Researchers from the Catholic University of Argentina warn that rising temperatures will increase inactivity and premature deaths by 2050 across 156 countries.
3/16/2026 • Climate Science & Impacts • General
A Lancet Global Health modelling study projects temperature-driven physical inactivity increases by 2050, with disproportionate premature death risk in low- and middle-income countries.
3/21/2026 • Climate Science & Impacts • General
A modeling study from Lancet Global Health finds higher temperatures reduce physical activity worldwide across 156 countries from 2000 to 2022, with projections through 2050.
3/16/2026 • Climate Science & Impacts • General
Researchers publishing in The Lancet Planetary Health found that age-specific vulnerability could expose approximately 290 million older adults to dangerous heat annually at 1.5 degrees Celsius of global warming worldwide.
8/18/2026 • Climate Science & Impacts • General
Modeling in The Lancet Global Health links sustained heat-driven reductions in physical activity to additional premature deaths by 2050, with uneven risks across age and cooling access.
3/18/2026 • Climate Science & Impacts • General