What is the common examiner trap about Environment in UPSC exams?

They may swap the warming scenario: e.g., 'At 1.5°C, over 80% of elderly are affected' (correct: at 3°C). Or confuse 'hours of intolerable heat' with 'consecutive days'. Also, the study’s threshold is not a death line but the point where core temperature cannot stabilize.

What should UPSC aspirants remember about Environment for Prelims?

1. Target this Data: Over 80% of India’s elderly face dangerous heat at 3°C warming; 180 hours/year threshold. 2. Target this Nodal Body: The Lancet Planetary Health (journal); lead author Prof Qinqin Kong. 3. Target this Region: South Asia (India, China, Pakistan, Bangladesh) accounts for 73% of world’s older population.

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News 14 of 21

Lancet Study: Over 80% of India's Elderly Face 2,000+ Hours of Intolerable Heat at 3°C Warming

Q: Which international journal published the study on age-specific heat tolerance and global warming mentioned in the news?

The Lancet Planetary Health, The study was published in The Lancet Planetary Health, a journal focusing on planetary health and sustainability. The other options are also reputable journals but not the one mentioned in the article.

Q: Consider the following statements regarding the Lancet study on heat stress: 1. At 3°C global warming, over 80% of India's elderly population could face at least 180 hours of intolerable heat annually. 2. The study found that young adults face the same level of risk as older adults at 1.5°C warming. 3. The Indo-Gangetic Plain is projected to experience more than 2,000 hours of intolerable heat per year at 3°C warming. Which of the statements given above is/are correct?

Both 1 and 3, Statement 1 is correct as per the article. Statement 2 is incorrect; young adults do not face similar risk until 4°C warming (17% affected). Statement 3 is correct: at 3°C, Delhi and Indo-Gangetic Plain exceed 2,000 hours of intolerable heat per year.

Q: According to the Lancet study, what percentage of the world's older population lives in South Asia (India, China, Pakistan, Bangladesh)?

73%, The article states that these four countries account for 73% of the world's older population. 63% and 83% are close distractors, while 93% is too high.

Q: Why do older adults face higher health risks from heat compared to younger adults, as highlighted in the study?

Older adults have reduced ability to regulate body temperature due to less sweating, slower blood vessel response, and higher cardiac strain., The article explains that aging diminishes thermoregulation: older people sweat less, blood vessels respond more slowly, and the heart works harder in heat. Options A and B are factually incorrect; option D is not supported by the study.

Environment Social IssuesCORE

Target:UPSC GS-IIIMPSCTeachingPrelims HighMains High

17 Aug 2026

~2 min

Source: Indian Express

Key Data:3°C global warmingOver 80% of India's elderly180 hours/year73% of world's older population in South Asia290 million older adults at 1.5°C490 million young adults at 4°C

Bodies:The Lancet Planetary HealthIIPH-Gandhinagar

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~2 min · Quick mode

What This Article Covers

1.At 3°C warming, >80% of India’s elderly and >50% of total population face ≥180 hours/year of dangerous heat; Delhi/Indo-Gangetic Plain may see >2,000 hours.

2.South Asia (India, China, Pakistan, Bangladesh) accounts for 73% of world’s older population – most at risk.

3.Previous studies underestimated heat risk by at least two-fold as they used healthy young adult thresholds; older adults have reduced thermoregulation.

The Big Picture

Prelims · HighMains · High

A Lancet Planetary Health study reveals that at 3°C global warming, over 80% of India's elderly and more than half the population could face at least 180 hours of intolerable heat annually. The research underscores that older adults are vulnerable at lower temperature-humidity levels than previously assumed, demanding age-sensitive heat action plans and urgent emission cuts.

Exam Lens

Quick Exam Facts From News

Warming Scenario3°C global warming

Elderly at risk (India)Over 80%

Intolerable heat threshold≥180 hours/year

World’s older adults in South Asia73%

At 1.5°C, world elderly affected290 million (22%)

At 4°C, young adults affected490 million (17%)

Each degree adds~1 billion more people exposed

Peak heat monthsMay to September

1-Minute Revision

›Warming Scenario: 3°C global warming
›Elderly at risk (India): Over 80%
›Target this Data: Over 80% of India’s elderly face dangerous heat at 3°C warming; 180 hours/year threshold.
›Target this Nodal Body: The Lancet Planetary Health (journal); lead author Prof Qinqin Kong.
›Target this Region: South Asia (India, China, Pakistan, Bangladesh) accounts for 73% of world’s older population.

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News Snapshot

👴

Elderly Vulnerability

Older adults face dangerous heat at lower temperature-humidity than healthy young adults due to diminished thermoregulation.

🌍

Geographic Hotspots

South Asia, especially India, Pakistan, Bangladesh, and the Indo-Gangetic Plain, will experience the highest exposure.

📋

Policy Implications

Heat action plans must move beyond single-threshold warnings and incorporate age, humidity, night temperatures, and local demographics.

Detailed Analysis & Strategic Depth

Context / Background

Global warming is projected to reach 1.5°C by ~2030 and 3°C by the end of the century under current policies. Older adults (60+) are physiologically more vulnerable to heat: reduced sweating, slower vascular response, and higher cardiac strain. This study from The Lancet Planetary Health is the first to map age-specific heat tolerance globally using lab experiments on three age groups.

Core Analysis & Implications

At 3°C warming, over 80% of India's elderly and >50% of the total population will face at least 180 hours of intolerable heat annually. In Delhi and the Indo-Gangetic Plain, the figure exceeds 2,000 hours (concentrated May–September). Night-time heat leaves no recovery window, straining cooling, electricity, and health services. Previous studies underestimated risk by at least two-fold because they used thresholds for healthy young adults.

Future Outlook / Way Forward

The study calls for age-sensitive heat-health early warning systems, special alerts for elderly living alone or with chronic illness, improved access to cooling, and heat-emergency plans. Crucially, cutting emissions remains essential to reduce prolonged round-the-clock heat exposure. India’s heat action plans must incorporate humidity, night temperatures, and local demographics rather than relying on single maximum-temperature thresholds.

Key Facts at a Glance

Warming Scenario3°C global warming

Elderly at risk (India)Over 80%

Intolerable heat threshold≥180 hours/year

World’s older adults in South Asia73%

At 1.5°C, world elderly affected290 million (22%)

At 4°C, young adults affected490 million (17%)

Each degree adds~1 billion more people exposed

Peak heat monthsMay to September

You've read the full analysis. Now test your understanding.

Practice exam-style questions based on this article.

Q1Static LinkageEasyUPSC, SSC, Banking

Which international journal published the study on age-specific heat tolerance and global warming mentioned in the news?

Q2Statement-basedHardUPSC, SSC

Consider the following statements regarding the Lancet study on heat stress:

1. At 3°C global warming, over 80% of India's elderly population could face at least 180 hours of intolerable heat annually.

2. The study found that young adults face the same level of risk as older adults at 1.5°C warming.

3. The Indo-Gangetic Plain is projected to experience more than 2,000 hours of intolerable heat per year at 3°C warming.

Which of the statements given above is/are correct?

Q3Data-centricMediumUPSC, SSC, Banking

According to the Lancet study, what percentage of the world's older population lives in South Asia (India, China, Pakistan, Bangladesh)?

Q4Application/ImpactMediumUPSC, SSC, Teaching

Why do older adults face higher health risks from heat compared to younger adults, as highlighted in the study?

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Lancet Study: Over 80% of India's Elderly Face 2,000+ Hours of Intolerable Heat at 3°C Warming

Exam Lens

Quick Exam Facts From News

1-Minute Revision

News Snapshot

Elderly Vulnerability

Geographic Hotspots

Policy Implications

Detailed Analysis & Strategic Depth

Context / Background

Core Analysis & Implications

Future Outlook / Way Forward

Prelims Flashpoints

Key Facts at a Glance