Thinking · The Thesis

Climate change is a healthcare story. Heat alone cost India ₹18.5 lakh crore last year.

Abhijith Magal L · 17 July 2026 · 11 min read

I spent nine years in global pharma, and the moment that rearranged my thinking happened nowhere near a boardroom. It happened in the field, watching patients with chronic conditions make round trips of several hours for a consultation that lasted three minutes. The medicine existed. The clinic existed. The programme funding existed, signed off and reported. What kept collapsing was everything between the patient and the care: the heat on the road, the bus that stopped running, the wages lost to a day of travel, the follow-up missed because the last trip cost too much.

Every one of those failures had a budget line somewhere calling it something else. Attrition. Non-adherence. Low uptake. Nobody's report had a column for the weather.

The claim, plainly

Climate change is a healthcare story. Not an environmental one, in the sense that matters to anyone running a programme, a workforce or a supply chain: the damage lands on people first, and it lands hardest on the people already furthest from care. Heat decides who reaches a clinic. Floods decide whether the medicine arrives. Air pollution decides how many chronic patients a health system carries. These are healthcare access questions, and in India they now have numbers attached. Large ones.

The gap between care that exists on paper and care people can actually reach once climate disruption is counted is what we call climate-access. The rest of this page is the evidence, one pathway at a time.

How does climate change affect healthcare access?

Through four routes, each measurable. Heat keeps patients from travelling and health workers from working. Floods cut the roads and supply lines that carry medicine. A warming climate widens where infectious disease can take hold. And air pollution raises the baseline chronic load every health system, and every employer, already carries. Here is what each looked like in India's most recent data.

Heat closes the road to care

The average Indian experienced 19.8 heatwave days in 2024. The Lancet Countdown attributes 6.6 of those days directly to climate change: a third of the country's heatwave burden would simply not have happened without it. Each person now faces around 366 more hours of health-threatening heat-stress risk per year than in the 1990s. The economic reading of the same data is those 247 billion lost labour hours, worth roughly USD 194 billion (₹18.5 lakh crore) in a single year.

Read that as a healthcare access number, because it is one. Lost labour hours are lost wages, and lost wages are skipped consultations and rationed prescriptions in households paying for care out of pocket. Heat also degrades medicines stored without reliable cooling and pulls community health workers off their rounds. We have written separately about why the heat season is a healthcare operations problem; the short version is that summer now behaves like a supply shock that arrives on schedule.

Floods break the supply line

When researchers studied 29 primary health centres after the 2008 Odisha floods, 65.5 per cent reported disrupted road access, essential medicine stock-outs ran six to ten days, and 44.8 per cent of patients rated chronic disease care as poor during the period. The facilities stood. The system around them did not. That pattern has repeated every monsoon since, and this one is no exception: while national rainfall recovered from a 30 per cent deficit to 14 per cent in the first nine days of July, the North East flooded badly enough to reach Cabinet review. Averages hide the access story. Somewhere is always underwater, and somewhere else is always running dry.

A warming map of disease

More than half of all known human infectious diseases can be aggravated by climatic hazards. That finding, from Mora and colleagues in Nature Climate Change, is worth sitting with: it covers dengue and malaria riding expanding mosquito ranges into new districts and higher altitudes, cholera and typhoid moving through flood-contaminated water, even fungal infections adapting to a warmer world. The WHO projects around 250,000 additional deaths a year between 2030 and 2050 from climate-sensitive causes.

The access consequence is quieter than the mortality one, and it compounds. A district that has never managed dengue does not hold the test kits, the trained staff or the platelet supply on the day the first cluster arrives. Every widened transmission zone is a new patient load landing on facilities that were not staffed, stocked or funded for it, and the surge does not wait for the next budget cycle. Endemic disease maps are being redrawn faster than the systems built around the old maps can follow. That lag, between where disease now goes and where capacity still sits, is itself an access failure, and it is invisible in any report that only counts cases.

Air, the quiet chronic engine

Air pollution is linked to nearly one in five deaths worldwide, and it drives the respiratory and cardiovascular disease that fills chronic care programmes. Chronic care is exactly where access is weakest. The WHO estimates only about half of patients with chronic conditions in developing countries take medicines as prescribed; one Mumbai study of hypertensive patients found adherence at 23.7 per cent. Climate stress does not create that fragility. It finds it, and widens it.

A three-minute consultation should not cost a day's wages and a day's heat. For millions of patients, it already does.

What "access" actually means

Access is not one thing, which is why climate damage to it hides so well. It has four dimensions. Availability: does the care or medicine exist where it is needed? Affordability: can the patient pay for it, including the hidden costs of travel and lost wages? Reachability: can they physically get to it, today, in this weather? Continuity: can they keep getting it, month after month, through every season? (Full definitions live in our glossary.)

Most health programmes are designed and reported against the first dimension, sometimes the second. Climate change attacks the third and fourth hardest. A heatwave rarely destroys a clinic. It empties the road to it. A flood rarely wipes out a medicine. It strands the stock for ten days, which for a chronic patient is the same thing.

Run one hypothetical year to see how the arithmetic bites. A hypertensive daily-wage worker needs twelve monthly refills. Each refill is a half-day trip that costs wages. Now place her 2024 over the top: 19.8 heatwave days, a monsoon that cuts her road at least once, a season of bad air aggravating her blood pressure. If heat and flood between them break just two of her twelve trips, a sixth of her treatment year is gone before anything clinical has happened. Layer that on a baseline where only around half of chronic patients adhere at all, and the WHO's adherence problem stops looking like patient behaviour and starts looking like weather plus distance plus money. Her programme will record her as a defaulter. The record will be arithmetically true and diagnostically useless.

What is climate-access?

We coined the term because the gap needed a name before anyone could own it. Health systems measure disease. Sustainability teams measure emissions. Climate-access sits between them and asks a different question: for this population, this workforce, this programme, which dimension of access is climate already breaking, and what would it take to see it happening in the data rather than in the shortfall? The mismatch between what climate breaks and what programmes measure is the whole reason the story stays untold inside organisations otherwise drowning in dashboards.

The measurement gap nobody owns

We benchmarked the FY2024-25 BRSR disclosures of 59 listed Indian companies while building our climate-access exposure assessment. The pattern is consistent: climate risk is disclosed as an emissions and asset question, health is reported as a benefits and safety question, and the space between them, where climate disruption meets workforce health and community access, belongs to no line item and no owner. A company can file a complete, compliant report and still have no idea how many working hours it lost to heat, how exposed its distributor network is to a bad monsoon, or what share of its CSR health spend is quietly being eroded by the climate it does not measure.

The disclosure rules are moving faster than that gap is closing. BRSR Core assurance extends from the top 500 to the top 1,000 listed companies from FY2026-27, which means several hundred sustainability teams are about to attest to value-chain claims with no measured view of their climate-health exposure. (Our regulations and standards library tracks what each rule actually requires.)

This is not a criticism of the teams involved. Nobody handed them a column for it. Climate-access is that column: the exposure that sits between the sustainability report and the health programme, measurable if anyone chooses to measure it.

Whose story it is

The thesis lands differently depending on where you sit, and it should.

• Pharma and healthcareFor you, climate change is a patient-access story. Every adherence curve and programme uptake number already carries a climate signal nobody has separated out.
• Manufacturers and employersFor you, it is a workforce-health story. Those 247 billion lost labour hours were lost somewhere, and duty-of-care mandates from global headquarters now arrive with deadlines.
• Insurers and financeFor you, it is a health-cost story. Heat, air and widened disease ranges reprice morbidity before they ever appear in a catastrophe model.
• CSR and sustainability headsFor you, it is a programme-defensibility story. A Section 135 budget spent without a climate lens is a budget that gets harder to defend at every audit as the BRSR clock tightens.

Different desks, one structural shift. Which is the point: filing heat, floods, disease and air as separate events is exactly how the healthcare story stays invisible.

The honest counter-arguments

The fair pushback is attribution. India has always had brutal summers and flooding monsoons; poor access predates any warming trend, and untangling climate's share from poverty, infrastructure and governance is genuinely hard. All true. It is also why the attribution science matters so much: 6.6 of 19.8 heatwave days is not a vibe, it is a measured climate fingerprint on a defined burden. The claim here is not that climate change invented India's access problem. The claim is that it is measurably widening it, on every dimension.

The second pushback usually arrives from a corner office with functioning air conditioning: our facilities are urban, our people are indoors, this is a rural problem. Look one layer down the chain. The distributor's van, the field force, the last-mile delivery rider, the patient population a CSR programme exists to serve, the construction and warehouse workforce behind every consumer business: the exposure sits exactly where the organisation stops looking. Treating the widening as background noise is a choice, not a neutral default. Organisations get to make that choice once. The disclosure rules make it for them after that.

Back to the three minutes

The patient making a day-long round trip for a three-minute consultation was never having an environmental problem. She was having a healthcare problem, shaped by heat, distance and money, and every year the shaping gets stronger. Somewhere in your operations, your workforce or your programme data, her equivalent already exists. The question is whether anything you measure can see her.

Abhijith Magal L

Founder, Syntropy Earth. Nine years in global pharma across brand, commercial and health-equity work, including collaboration with the WHO-Foundation and UNICEF. Writes on where climate and health actually meet.

Last updated: 17 July 2026