«ISLANDS OF HEAT»: Europe in a Climate Trap

Pierre Masselot is a research fellow at the London School of Hygiene & Tropical Medicine / lshtm.ac.uk

Life in European cities may soon become increasingly unsafe. This statement was recently made by scientists developing climate models. In their view, the number of heat-related deaths in Europe could rise sharply over the next century. The bad news is that even with efforts to improve safety, cities will remain highly dangerous for people as temperatures continue to rise.

A CENTURY OF EXTREME TEMPERATURES

ccording to a comprehensive report modeling the consequences of rising temperatures, global warming poses a serious threat to the stability of life on the European continent. Research indicates a growing number of heat-related deaths and illnesses.

Warming leads to drastic changes in both nature and society. For example, it worsens health issues and contributes to the spread of ticks and parasites that carry diseases across Europe. Taken together, these trends suggest that by the end of the century, an additional 2.3 million people could die in European cities due to extreme temperatures.

COOLING TECHNOLOGIES PROVING INEFFECTIVE

Scientists reached these conclusions after analyzing temperature and mortality data from 854 urban areas across 30 European countries. They developed a predictive model that accounts for temperature-related deaths between 2015 and 2099.

The study considered various warming scenarios as well as countermeasures devised by European governments. Numerous strategies have been proposed to protect people from heat, including enhanced indoor air conditioning, water spraying in public spaces, expanding green areas, creating artificial shade, and reducing vehicle emissions. However, it remains unclear how effective these urban cooling technologies will be in truly shielding populations from deadly heat waves.

A DEADLY THREAT TO THE MEDITERRANEAN

The results, published in Nature Medicine, reveal that Europeans are nearly defenseless against lethal heat. Climate models show that even under the most optimistic scenarios, heat-related deaths far outnumber those caused by cold, and the total number of temperature-related fatalities could rise by nearly 50%.

Certain regions in Europe are emerging as especially high-risk zones for extreme heat. According to the trends identified by researchers, Mediterranean areas will be the hardest hit. Experts from the London School of Hygiene & Tropical Medicine believe that the highest risk zones will include eastern Spain, southern France, most of Italy, and Malta.

HEAT IS DEADLIER THAN COLD

Commenting on the findings, Pierre Masselot, a statistician and environmental epidemiologist, states that Europeans clearly need to undergo a large-scale adaptation to rising temperatures. However, scientists are unsure how such a level of adaptation could be achieved in practice.

Currently, the number of people in Europe dying from cold-related causes is ten times higher than those dying from heat. But this is expected to change as global temperatures rise: cold-related deaths will decline, while fatalities caused by extreme heat will increase.

In some regions, the likelihood of extreme heat has increased by up to 100 times. In recent years, several European countries have already endured record-breaking heat waves. Climate change, which has made European heatwaves about 3°C hotter, has been linked to tens of thousands of deaths.

MORTALITY RISING EITHER WAY

In their climate modeling, Masselot and his colleagues developed four potential scenarios in which global temperatures rise by 1.5°C, 2°C, 3°C, and 4°C. They also compared these projections with possible adaptation strategies that European countries might implement to reduce heat-related mortality — by 10%, 50%, or 90%.

The researchers found that even with a 50% reduction in risk, mortality continues to rise as temperatures increase. The key question, however, is how to achieve even that 50%. According to Masselot, even reducing the risk by 10% is a «non-trivial» task. Despite serious efforts by European societies, all warming scenarios lead to only minimal reductions in deaths.

If heat-related risks could be reduced by 90%, even a 4°C rise in temperature could be offset, reversing the trend of excess mortality. Unfortunately, Masselot considers this scenario theoretically possible but practically unachievable.

SOUTHERN EUROPE’S «HEAT ISLANDS»

Masselot’s models suggest that people over 65 living in Southern European cities will be particularly vulnerable. In these regions, temperatures are projected to rise much faster than in surrounding areas — a phenomenon climate scientists describe as «urban heat islands».

Some European cities are at risk of becoming exactly that. Still, climate models are not a sentence — they carry a degree of uncertainty. However, even taking possible variations into account, the overall trend remains clear.

Scientists emphasize that these models are not intended to fuel despair, but to encourage European societies to begin seeking effective solutions now — before it’s too late.

Original research: