Summary

Europe’s extreme summer heat in 2026 has imposed substantial human and economic costs, including elevated heat-related mortality, pressure on healthcare systems, and severe wildfire damage. The main ways in which heat affects EU GDP are through lower agricultural output and higher food prices, constrained energy production alongside higher electricity prices, transport disruption, and reduced labour productivity. The total EU-wide GDP impact in 2026 is estimated at around -1%. Reduced labour productivity is likely to have the largest economic impact, particularly in heat-exposed sectors and countries with limited acclimatisation or low air-conditioning penetration. The impact differs significantly by country; France appears the most impacted economically, followed by Italy and Spain. The Netherlands sees annual growth largely erased, while Poland is less affected as it experiences fewer extremely hot days. Adaptation can reduce some damage but cannot eliminate it; stronger mitigation and demand-side climate policies are required to avoid a worsening cycle of heat damage and weakened climate action.

Weather and society

Extreme heat affects the economy through direct human effects, damage to ecosystems, and the costs of repairing heat damage. Human health has been severely impacted, with an estimated 20,400 heat-related deaths across France, Germany, Spain, and Italy during the heatwave of 22–28 June alone. Total estimated heat deaths for the summer are roughly 25,000. Beyond mortality, heat increases rates of suicide, domestic violence, and acute kidney injury, which represent a significant loss in wellbeing. The effects are unequal, with regions experiencing greater deprivation and energy poverty showing substantially higher heat-mortality risks. Older adults living alone or in poorly insulated homes carry a disproportionate burden. Additionally, the EU has recorded 434,976 hectares burned in one of the worst wildfire seasons on record, notably in Spain, Italy, and France. These fires destroy habitats for numerous species and create direct public costs, including wildfire response and increased healthcare pressure. Estimating costs based on life-years lost suggests a health impact of €1.5–7 billion, with wildfire damage contributing a further €0.1–4.6 billion.

Negative effects on GDP

The research assesses the impact on Gross Domestic Product through four key areas: food and agriculture, energy production, transport and logistics, and labour productivity. Heat and drought have cut EU crop-yield and dairy production forecasts for 2026, pointing to a GDP effect of around 0.15 percentage points. Constrained nuclear, hydro, and thermal generation, combined with reduced solar energy efficiency and higher wholesale electricity prices, adds a further 0.12–0.15 points. Reduced rail, road, and inland-waterway capacity, along with logistics disruption, contributes an estimated 0.15 points. The largest and best-anchored effect is labour productivity. Worker output falls measurably once temperatures exceed a threshold of 25–30°C. Output per hour worked falls by roughly 3% for every degree above a 30°C threshold sustained over several days. Countries more acclimatised to extremely hot weather show slightly lower productivity losses, demonstrating that some adaptation is possible. Spain and Italy have the highest physical exposure, but decades of acclimatisation reduce the marginal effect of hot days. In contrast, Poland has a highly exposed workforce and low air-conditioning penetration, meaning hot days have a high marginal effect. Total adverse effects to GDP are estimated at -1% for the EU, approximately €180 billion, which equals the expected economic growth for the year.

Policies

Damage can be partially reduced through adaptation measures such as shifting crop varieties, insulating buildings, shifting working hours, and expanding air conditioning. However, these measures are costly and cannot prevent all harm. Access to protection is unequal, as wealthier households can afford insulation and cooling, while low-income households often live in poorly insulated homes. Adaptation is found to be only partial; one modelled European estimate suggests it could cut labour-productivity losses by around 40% but not eliminate them. Furthermore, air conditioning raises electricity demand at the exact moments supply is most constrained. The report concludes that adaptation alone is insufficient, and further warming raises damages non-linearly. The more durable solution is urgent mitigation of emissions. This cannot rely on technological substitution alone; mitigation requires demand-side complements that manage and moderate total energy and material demand directly, alongside supply-side decarbonisation.

A pattern, not a coincidence

The report highlights a ‘doom loop’ where climate damage slows the economy, and the subsequent political response is to loosen policies meant to prevent that damage in the name of protecting growth and competitiveness. For instance, in July 2026, the European Commission tabled a weakening of the EU’s main carbon-pricing instrument despite record wildfires and heat-related deaths. This response leads to rising emissions and exposure, which in turn increases the costs of the next heatwave. Although the current arithmetic is not yet catastrophic, these losses will accumulate and accelerate without decisive action. Every year of adaptation without mitigation is described as a year borrowed against a hotter baseline. The choice for Europeans and policymakers is between continuing to pay for increasingly costly summers or treating climate change as an urgent emergency requiring immediate mitigation to protect wellbeing and the economy.