The Lancet Countdown’s 2026 Europe report on health and climate change is the third in its series, tracking data up to 2025. Its central finding is not that Europe faces health risks from a changing climate. It is that those risks are distributed unequally, both between regions and within them.

What the report tracks

The Countdown is a monitoring exercise rather than a single study. It follows a set of indicators year on year — heat-related mortality, drought exposure, the spread of disease vectors, adaptation spending, finance and public engagement — and this edition adds seven new indicators along with methodological updates and extended time series.

That design matters for how the findings should be read. A monitoring series is built to detect direction over time rather than to establish causation in a single year, and its value increases as the series lengthens.

The regional split

The report finds higher risk of heat-related mortality, drought, West Nile virus outbreaks and tick exposure in southern, eastern and western Europe compared with other parts of the continent.

The vector findings are the ones worth pausing on, because they describe something changing rather than something intensifying. West Nile virus is carried by mosquitoes and ticks carry Lyme disease and tick-borne encephalitis; both depend on temperature and humidity for the length of their active season and the range they can occupy. As conditions shift, the geography of these diseases shifts with them.

The practical consequence is a health system problem rather than only an environmental one. Clinicians diagnose what they expect to see. A disease appearing several hundred kilometres north of where it was previously endemic is missed for a period, because nobody is looking for it.

The income finding

The report records that low-income respondents had a 10.9 percentage point higher risk of experiencing food insecurity than median-income respondents, with a confidence interval of 10.45 to 11.45.

A narrow confidence interval around a large effect is a strong result. It says the estimate is precise as well as substantial, which is not always the case in survey-based work of this kind.

The report is careful to note that not all indicators could be disaggregated by socioeconomic status, and that where area-level disaggregation was possible it suggested economically deprived groups were more exposed. That is a limitation stated by the authors rather than one a critic has to find, which is generally a marker of work worth trusting.

Why inequality is the finding rather than a footnote

Heat illustrates the mechanism most clearly. Exposure to a heatwave is not evenly distributed within a city. It depends on whether a home has insulation or cooling, whether the neighbourhood has tree cover, whether work is outdoors, and whether a person can afford to run air conditioning or take time off.

The same temperature therefore produces very different health outcomes depending on income. That is why adaptation policy that treats a country as a single unit tends to underperform: the national average conceals the population actually at risk.

This is general information about a research report and not medical advice. Anyone concerned about heat, tick exposure or their own health should speak to a clinician who knows their history.

Sources

• The 2026 Europe report of the Lancet Countdown on health and climate change, The Lancet Public Health, open access under CC BY 4.0
• World Health Organization material on climate change and health
• Published literature on vector range shifts for West Nile virus and tick-borne disease in Europe