Scientists say human-caused climate change made the record-breaking heatwave in Western Europe this week 100 times more likely [1].
The finding highlights the intensifying impact of global warming on regional weather patterns, specifically affecting night-time temperatures that typically provide relief during heat events.
Clair Barnes, a research associate at Imperial College London, said the occurrence was "not particularly surprising" given current climate trends [1]. The extreme heat has pushed temperatures to record levels across the region, creating hazardous conditions for public health and infrastructure.
According to the research, the soaring night-time temperatures observed this week were 100 times more likely [1] than they would have been just two decades ago. This shift is attributed directly to human-caused warming, which has altered the atmospheric conditions necessary for such extremes to occur.
Scientists said that these specific temperature spikes would have been "virtually impossible without human-caused climate change" [1]. The data suggests that the baseline for "normal" summer weather has shifted, making previous anomalies the new standard for the region.
The heatwave has strained energy grids and increased the risk of heat-related illnesses. While daytime highs are often the focus of climate reports, the lack of nocturnal cooling is a critical factor in how heatwaves impact human biology, and urban environments.
“virtually impossible without human-caused climate change”
The drastic increase in the likelihood of extreme night-time heat indicates that the 'cooling window' for cities and natural ecosystems is closing. When temperatures do not drop significantly overnight, the cumulative heat stress on the human body and infrastructure increases, potentially leading to higher mortality rates during heatwaves and a greater reliance on energy-intensive cooling systems.
