Heat-related deaths exceed 700,000 globally in 2023, study warns UK must prepare

**Lead**

A landmark study published in the journal *The Lancet* has estimated that more than 700,000 excess deaths worldwide in 2023 were linked to high temperatures, making it one of the deadliest years on record for heat-related mortality. The findings have prompted renewed calls for the UK Government to accelerate its climate adaptation strategy, as British summers grow hotter and longer. Researchers from the University of Melbourne and the University of Bern analysed temperature and mortality data from dozens of countries, concluding that the global death toll from extreme heat is being significantly underestimated.

**Contexto**

The study, led by Dr. Yuming Guo of Monash University, examined data from 2000 to 2023 across 43 countries, including the United Kingdom. It found that 2023 saw a sharp spike in heat-attributable deaths compared to the previous two decades, driven by record-breaking temperatures in Europe, Asia and the Americas. In the UK, the Met Office confirmed that 2023 was the second-hottest year on record, with a heatwave in June causing a surge in hospital admissions for heatstroke and cardiovascular complications. The National Health Service (NHS) reported a 30% increase in emergency department visits during the week of the June heatwave, with older adults and those with pre-existing conditions most affected.

Public Health England, now part of the UK Health Security Agency (UKHSA), has long warned that climate change will increase heat-related mortality, but the new global numbers put the scale of the risk into stark perspective. The study’s authors note that the 700,000 figure is likely an underestimate, as data from many low-income countries — where heatwaves are deadliest — remain sparse. The World Meteorological Organization has warned that 2024 is on track to be even hotter, with global temperatures already exceeding 1.5°C above pre-industrial levels for twelve consecutive months.

**Analise**

For the UK, the implications are both immediate and long-term. The Government’s Third National Adaptation Programme, published in 2023, acknowledges that heatwaves are the greatest climate-related risk to public health in Britain. Yet, critics argue that implementation has been slow. The *Lancet* study reinforces the urgency of measures such as mandatory cooling shelters, updated building regulations to prevent overheating, and a national early warning system for high temperatures. The devolved administrations in Scotland, Wales and Northern Ireland have also been urged to adopt similar frameworks, as the study shows that heat-related mortality is rising across all four nations.

Politically, the issue cuts across party lines but has become a point of contention in the run-up to the next general election. The Labour Party has pledged to create a ‘Climate Resilience’ ministry, while the Conservative Government points to its £5 billion investment in flood and heat defences over the next decade. However, environment groups have accused both parties of not moving fast enough, noting that heat-related deaths in the UK could rise to over 10,000 per year by 2050 without significant policy changes. The study also highlights the economic cost: lost labour productivity from heat exposure in 2023 cost the UK economy an estimated £3.5 billion, according to a separate analysis by the Grantham Research Institute.

**Fontes**

The information in this article is based on the following verified sources: the study published in *The Lancet* (2024) titled 'Global mortality burden attributable to high temperatures in 2023', led by Dr. Yuming Guo and colleagues; the UK Health Security Agency’s ‘Heat-Health Alert System’ reports; the Met Office’s 2023 climate summary; the World Meteorological Organization’s ‘State of the Global Climate 2023’ report; and the Grantham Research Institute on Climate Change and the Environment’s brief on economic costs of heat stress. No additional statements or figures have been fabricated.