Charles Rotter
On November 4 the World Health Organization put out a news release timed for COP31, headlined “Six climate and health actions could save 1.6 million lives and deliver trillions in benefits each year.” It opens:
Six proven climate and health measures could save 1.6 million lives a year while delivering trillions of dollars in economic and fiscal gains, according to a new World Health Organization (WHO) report released today. Scaling up these measures globally, from heat-health warning systems and climate-resilient water, sanitation and hygiene to clean household energy and efficient fossil fuel pricing policies, could generate US$ 3.9 trillion in economic welfare benefits annually, while also helping to cut carbon emissions. They could deliver a further US$ 5.4 trillion a year in fiscal benefits.
https://www.who.int/news/item/04-11-2026-six-climate-and-health-actions-could-save-1.6-million-lives-and-deliver-trillions-in-benefits-each-year
WHO Director-General Dr Tedros Adhanom Ghebreyesus said: “The climate crisis is a health crisis, but much of the harm it causes can be prevented with tools we already have.” Several paragraphs later the release says where most of the lives come from:
Efficient fossil fuel pricing policies, including removing inefficient subsidies and appropriately taxing these fuels, would generate the largest gains. These policies are estimated to prevent 1.2 million deaths and generate US$ 3 trillion in economic welfare benefits and US$ 5.4 trillion in fiscal benefits annually.
https://www.who.int/news/item/04-11-2026-six-climate-and-health-actions-could-save-1.6-million-lives-and-deliver-trillions-in-benefits-each-year
WHO’s questions and answers document breaks the total, 1.56 million, down by action in its Table 1. I charted it.
The two brown bars are air pollution. The 564-page technical report is plain about what the fossil fuel deaths are. WHO didn’t model them itself, just borrowed them from the IMF’s fossil fuel subsidies analysis and projected them forward:
Additionally, it was then assumed that over the period 2034 to 2043 the intervention would save the same number of lives per year as in 2034, assigning the IMF estimate of 1 568 883 expected deaths averted (that is, mortality reductions attributable to exposure to air pollution averted only) per each year within this period.
https://iris.who.int/server/api/core/bitstreams/1b391daa-7cfe-4c89-a2b5-ff2856e466a3/content
That is “air pollution averted only,” people breathing soot and smog from burning fuel, and their deaths have nothing to do with the temperature of the planet. The cooking action is the same thing indoors, computed with WHO’s Benefits of Action to Reduce Household Air Pollution tool, switching families from wood, charcoal and kerosene stoves to propane and electric.
Add the two and 1.29 million of the 1.56 million “climate” lives saved, 83 per cent, are air pollution deaths.
The three water actions carry “climate-resilient” in their names. The report explains where the climate part comes from:
We adopted the assumption of a 2019 WHO BCA published as part of the first WHO global investment case (135) that an additional 10% of the total benefits and costs related to WASH could be attributable to ensuring WASH services would be climate resilient in the future. This assumption is based on the judgment that additional goods and services would be needed to ensure the climate resilience of WASH systems (135).
https://iris.who.int/server/api/core/bitstreams/1b391daa-7cfe-4c89-a2b5-ff2856e466a3/content
WHO’s only climate adjustment for water and sanitation is to add 10 per cent to the benefits and costs, a figure it borrowed from a 2019 report. The deaths being counted are diarrhoea deaths from unsafe water and poor sanitation, which the report now files under climate adaptation.
That leaves heat–health warning systems, the only one of the six aimed at the weather, at 100,000 deaths a year, or 6 per cent. That is the source of the $835 back for every $1 in the release, because the warnings cost only $0.23 billion. I could find no step in the heat model that separates the deaths averted from heat blamed on warming from the rest.
Next are the dollar figures. Table 2 of the questions and answers puts the value of lives saved at $5,202 billion, more than the whole $3,920 billion of “economic welfare benefits,” because $2,352 billion of “efficiency costs” from the fuel pricing action, the value of fuel people no longer get to use, is subtracted as a negative benefit. Each death averted is priced with a value of a statistical life scaled from a U.S. figure of $13,429,139 by national income, following a WHO-led paper in the WHO’s own Bulletin. WHO says what those dollars are:
Unlike productivity gains, tax revenues or GDP increases, VSL-based monetary estimates are not real economic flows. Rather, they are welfare-based accounting measures used to represent society’s valuation of mortality reductions in economic analyses, such as benefit-cost analyses, for decision making on climate–health actions.
https://cdn.who.int/media/docs/default-source/environment-climate-change-and-health/for-web-faqs-methodology—global-benefits-and-costs-of-prioritized-actions-on-climate-change-and-health.pdf?sfvrsn=4da68c85_5
The $5.4 trillion in “fiscal benefits” is real money, collected from motorists, farmers and households. The report describes it:
These changes comprise the government spendings averted (representing the savings made for governments by not providing fossil fuel subsidies) and government revenue gained (from taxation of fossil fuels at the value added tax or general service tax rate).
https://iris.who.int/server/api/core/bitstreams/1b391daa-7cfe-4c89-a2b5-ff2856e466a3/content
WHO counts the extra money people would pay through higher fuel prices as a benefit to governments, and counts no cost against it, because the report says “This WHO analysis did not include any costs (as inputs) of the intervention.” The scale-up it models has every country on Earth removing every fuel subsidy and taxing every fossil fuel in 2024, “all subsidies removed, and tax introduced at the value added rate, for all fossil fuels,” which did not happen.
Most of the carbon savings also come from the fuel taxes. Of the 16.67 billion tonnes of CO₂e the release says the six actions would avoid, Table 1 credits 16.35 billion to the fuel taxes, and the three water actions and the heat warnings are listed as avoiding none at all.
How many of the 1.56 million would still be at risk in a world that had never warmed at all?
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Sources: WHO news release, 4 November 2026, https://www.who.int/news/item/04-11-2026-six-climate-and-health-actions-could-save-1.6-million-lives-and-deliver-trillions-in-benefits-each-year. Quotes from WHO, Global benefits and costs of prioritized actions on climate change and health: technical report, 2026, https://www.who.int/publications/i/item/9789240124813, and its questions and answers, FAQ PDF. Chart built from the figures in the questions and answers, Table 1.