Judge climate policy by bodies, not degrees: the Lancet's emergency call

Why do we still talk about climate change as if it were a thermometer problem? "1.5 degrees" is an abstraction. 710,000 heat-related deaths in a single year, more than two-thirds of them attributed to human-caused climate change, is not. The 10th Lancet Countdown report, released on October 28, is an argument for changing the unit of account.

What the report says

According to the report, as quoted by Hindustan Times, heat was linked to an average of 540,800 estimated deaths per year between 2016 and 2023. Of those, 68% were caused by climate change, up from 55% in 2006–2015. In 2023 alone, the hottest year in that period, the record was 710,000 deaths, more than malaria or HIV. Altogether, almost 3 million heat deaths are attributed to climate change over the period.

The authors, 146 researchers, want climate change recognized as a "global health emergency", with an emergency response mechanism coordinated among states, as Boursorama reports. It would be modeled on the WHO's approach to pandemics, but, in the words of executive director Marina Romanello, "not to react to a succession of emergencies" but to deliver a coherent long-term response.

Deaths are a better scoreboard than degrees

A temperature target tells you little about who is suffering. A health metric does. The report notes that Southeast Asia and Africa lost the equivalent of 3.9% and 3.2% of GDP to heat-related productivity losses, against 0.2% for Europe. The same planet-wide warming lands very differently on an outdoor worker than on an office worker with air conditioning. Even the Indian figures are concrete: more than 2,600 hours a year of moderate or higher heat-stress risk during moderate outdoor activity, and about 64 hours of lost sleep a year to hot nights.

In our view, that is the real shift. If governments were judged on heat exposure and avoidable deaths, adaptation spending (warning systems, cooling access, clinics that know who is vulnerable) would probably stop being the poor cousin of mitigation. We suspect health ministries would gain a seat at tables where, today, energy and finance ministries dominate.

There is also evidence that the health framing rewards action. The report credits cleaner air with preventing an estimated 323,000 deaths a year in at least 77 countries where fossil-fuel air pollution has fallen since 2016. Air pollution from fossil fuels still causes 2.73 million deaths a year, though. Cutting emissions is a health intervention with a measurable payoff, not a sacrifice for future generations.

Caveats: the numbers are models, and a label is not a budget

These deaths are not counted at bedsides as "caused by climate". As Prof. Ollie Jay of the University of Sydney explained, researchers took heat deaths recorded by states and subtracted those that would have occurred without climate change, based on a counterfactual scenario. That makes them estimates, so we would not read the third digit literally. The core message does not depend on it, though.

We are also skeptical that a declaration alone changes much. Whether the "emergency" label would unlock money is a forecast, not a fact, and we doubt it will do so on its own. The funding picture is not encouraging: as Sud Ouest reports, climate-health research funding rose sevenfold to US$316 million in 2024, but 84% goes to researchers in rich countries, while poorer countries are the most affected. Romanello also said that for the first time, some data sources, notably from the United States, had disappeared, including fossil fuel subsidies not made public by US authorities. You cannot manage what you stop measuring.

What to do with this

The report arrives before COP31 (November 9–20). Our recommendation is simple: ask negotiators, and your own local authorities, a different question. Not "what is the temperature target?" but "how many hours of dangerous heat will our workers, children and elderly face, and what protects them?" Only 56 of the WHO's 194 member countries have adapted their health systems so far, according to the report. The emergency declaration is the least important part of this document. The metric is the point.