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India’s Elderly Face Rising Heat Risk At 3°C Global Warming
India’s Elderly Face Rising Heat Risk At 3°C Global Warming: What A New Lancet Study Found
India’s heat risk could become significantly more dangerous for older adults as global temperatures continue to rise, according to a new study published in The Lancet Public Health. Researchers found that the health risks of extreme heat may have been underestimated because previous assessments often applied heat-tolerance thresholds based largely on younger adults to people across all age groups.
The new research takes a closer look at how age affects the body’s ability to cope with extreme heat. Its findings are particularly significant for countries such as India, where large populations already experience periods of severe heat and where the number of older adults is expected to grow.
The study estimates that at 3°C of global warming, more than 80% of India’s older adults could experience at least 180 hours of uncompensable heat stress annually. That is heat exposure severe enough to push the body beyond its ability to maintain thermal balance.
Our bodies constantly work to keep core temperature within a safe range. Sweating, increased blood flow to the skin and other physiological responses help release excess heat.
But there is a point at which these mechanisms are no longer sufficient.
This is known as uncompensable heat stress (UHS), a condition in which the body cannot shed heat quickly enough to maintain thermal balance. Prolonged exposure can cause core body temperature to rise and can potentially result in serious illness, including heatstroke.
The new study is significant because it shows that this threshold is not the same for everyone.
Age itself can affect how efficiently the body responds to heat. Older adults generally sweat less efficiently, while their cardiovascular systems may also have a harder time increasing blood flow to the skin to release heat. Existing medical conditions and medications can further increase vulnerability.
Researchers found that the temperature at which adults aged 60 and above can no longer maintain a stable core temperature is approximately 4.7°C to 7.5°C lower than the corresponding threshold for young adults, depending on the conditions being considered.
That means a temperature or combination of heat and humidity that might remain within a younger person’s physiological tolerance can pose a much greater risk to an older person.
The study examined future heat exposure under different levels of global warming, from 1.5°C to 4°C above pre-industrial levels.
At higher warming levels, the number of people exposed to uncompensable heat rises sharply. India is among the countries expected to face a particularly significant burden because of its large population, hot climate and rapidly ageing population.
At 3°C of global warming, the researchers’ projections indicate that more than four in five older adults in India could face at least 180 hours of uncompensable heat each year.
The finding does not mean that 80% of India’s elderly population will necessarily suffer heatstroke or die. Rather, it represents projected exposure to a physiological level of heat at which the body struggles to maintain thermal balance.
That distinction is important.
Extreme heat does not need to reach the point of heatstroke before it becomes dangerous.
Heat exposure can place additional stress on the cardiovascular system and can worsen existing heart, kidney and respiratory conditions, particularly among older adults. Researchers also point out that physiological strain can begin before core body temperature starts rising continuously.
This is particularly important for older people living with chronic illnesses.
Someone with cardiovascular disease, diabetes, kidney problems or respiratory disease may therefore be more vulnerable during prolonged periods of extreme heat than a healthy younger person exposed to the same conditions.
One of the study’s central arguments is that age matters when assessing human heat tolerance.
Previous assessments have often relied on heat thresholds derived from studies of healthy young adults and then applied those thresholds more broadly across populations.
The researchers instead examined three age groups, young adults aged 15–39, middle-aged adults aged 40–59 and older adults aged 60 and above, to understand how their heat tolerance differs.
When age-specific vulnerability was incorporated into the modelling, the projected picture changed substantially.
The researchers found that older adults face more frequent and widespread uncompensable heat exposure even at lower levels of global warming.
The concern is not only about how hot a single day becomes.
Duration matters. According to the study’s findings, the number of people worldwide exposed to at least 180 hours of uncompensable heat annually is estimated to be two to eight times higher than earlier projections that assumed a common heat tolerance across age groups.
At 1.5°C of warming, the researchers estimate that around 22% of people aged 60 and above globally, approximately 290 million people, could experience at least one month of uncompensable heat each year.
As warming increases, that exposure expands further.
Climate change and demographic ageing are occurring at the same time. The global population aged 60 and above is projected to reach approximately 2.1 billion by 2050, roughly double its size in 2020. Much of this growth is expected in low- and middle-income countries, including India.
That means countries already dealing with severe heat could simultaneously see a larger share of their populations belonging to an age group that is physiologically less able to cope with it.
India has already experienced a significant heat-related health burden. Earlier Lancet Countdown research found that heat-related mortality among people aged over 65 increased substantially globally, with India among the countries recording some of the highest absolute numbers of heat-related deaths in this age group.
The findings highlight why heat-health warnings cannot be treated as a one-size-fits-all system.
Older adults may need to take precautions before temperatures reach the levels traditionally associated with extreme heat for younger adults.
During periods of severe heat, practical measures can include staying in cooler environments, avoiding strenuous outdoor activity during the hottest parts of the day, drinking adequate fluids when medically appropriate, checking on older relatives and neighbours, and following local heat-health advisories.
People with existing medical conditions should also follow advice from their healthcare providers, particularly if they take medicines that may affect hydration, blood pressure or the body’s response to heat.
The researchers argue that their findings should inform age- and region-specific heat action plans rather than relying solely on broad temperature thresholds.
This is especially relevant in India because heat exposure varies considerably across regions, and people’s ability to protect themselves from extreme heat also depends on housing, access to cooling, electricity, healthcare and socioeconomic conditions.
The study also notes that heat tolerance can vary between populations. The laboratory experiments used to establish physiological thresholds were conducted in the United States, and people living in consistently hot climates may have some degree of acclimatisation. The researchers tested the possibility of higher heat thresholds in warmer climates; although this reduced some exposure estimates, the study’s main conclusions remained unchanged.
The study’s message is not simply that the planet will become hotter. It is that the same temperature does not carry the same health risk for everyone.
As global temperatures rise and populations age, older adults could be exposed to dangerous physiological heat for longer and more frequently than previously estimated.
For India, the projected figure, more than 80% of older adults facing at least 180 hours of uncompensable heat annually at 3°C of global warming, underscores why protecting older populations needs to become a central part of heat preparedness.
And with heat exposure already increasing in many parts of the world, the researchers’ broader warning is clear: understanding who is most vulnerable to heat may be just as important as measuring how hot the planet becomes.
India can better protect its elderly from rising heat by integrating urban heat mitigation into routine city planning, infrastructure development, and urban design. This includes using cooler building materials, increasing greenery, and improving planning.
During heatwaves, individuals should drink water regularly, even if not thirsty, and use a cap, hat, or umbrella when outdoors. It is advisable to avoid going outside between 12 pm and 4 pm, which are typically the hottest hours. People should also watch for signs of heat exhaustion, such as dizziness, headache, or nausea, and seek medical attention if symptoms worsen.
The current reporting does not confirm if heat action plans will become age-specific across India. However, a new Lancet study suggests that protecting older populations needs to become a central part of heat preparedness.
Source: News18
Related Posts: India elderly heat risk, elderly heat stress India, Lancet heat stress study, Lancet elderly heat study, global warming India elderly, 3°C global warming India
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