Swiss Switzerland's President Guy Parmelin (C-L) remotely controls the Mars rover Polaris of the Xplore project next to Poland's President Karol Nawrocki (C-R) during their visit at the Swiss Federal Institute of Technology of Lausanne (EPFL) in Ecublens on May 28, 2026. Nawrocki is on two-day state visit in Switzerland. (Photo by Fabrice COFFRINI / AFP via Getty Images)

A person uses a fan as she sits on the Seine river banks behind the Notre-Dame Cathedral in Paris as a record-breaking early heatwave scorches a swathe of western Europe on May 28, 2026. The UK and France have reported their hottest ever May days this week as a "heat dome" brought sizzling temperatures more typical of midsummer to western Europe. UN climate chief Simon Stiell said the heatwave was "a brutal reminder of the spiraling impacts of the climate crisis. "The science is clear that human-induced climate change is making these heatwaves more frequent and extreme," Stiell add in a statement. (Photo by SIMON WOHLFAHRT / AFP via Getty Images)

A person uses a fan as she sits on the Seine river banks behind the Notre-Dame Cathedral in Paris as a record-breaking early heatwave scorches a swathe of western Europe on May 28, 2026. The UK and France have reported their hottest ever May days this week as a "heat dome" brought sizzling temperatures more typical of midsummer to western Europe. UN climate chief Simon Stiell said the heatwave was "a brutal reminder of the spiraling impacts of the climate crisis. "The science is clear that human-induced climate change is making these heatwaves more frequent and extreme," Stiell add in a statement. (Photo by SIMON WOHLFAHRT / AFP via Getty Images)

Poland's President Karol Nawrocki (C-R) remotely controls the Mars rover Polaris of the Xplore project next to Switzerland's President Guy Parmelin (C-L) during his visit at the Swiss Federal Institute of Technology of Lausanne (EPFL) in Ecublens on May 28, 2026. Nawrocki is on two-day state visit in Switzerland. (Photo by Fabrice COFFRINI / AFP via Getty Images)

Poland's President Karol Nawrocki (2nd R) remotely controls the Mars rover Polaris of the Xplore project next to Switzerland's President Guy Parmelin (C) and Poland's first lady Marta Nawrocka (3rd L) during his visit at the Swiss Federal Institute of Technology of Lausanne (EPFL) in Ecublens on May 28, 2026. Nawrocki is on two-day state visit in Switzerland. (Photo by Fabrice COFFRINI / AFP via Getty Images)

Poland's President Karol Nawrocki (C) holds a remote control beside Switzerland's President Guy Parmelin (L) as he interacts with students next to the Mars rover Polaris of the Xplore project during his visit at the Swiss Federal Institute of Technology of Lausanne (EPFL) in Ecublens on May 28, 2026. Nawrocki is on two-day state visit in Switzerland. (Photo by Fabrice COFFRINI / AFP via Getty Images)

A pharmacy sign indicates 32 degrees Celsius around 11h45 am in Paris as a record-breaking early heatwave scorches a swathe of western Europe on May 28, 2026. The UK and France have reported their hottest ever May days this week as a "heat dome" brought sizzling temperatures more typical of midsummer to western Europe. UN climate chief Simon Stiell said the heatwave was "a brutal reminder of the spiraling impacts of the climate crisis. "The science is clear that human-induced climate change is making these heatwaves more frequent and extreme," Stiell add in a statement. (Photo by SIMON WOHLFAHRT / AFP via Getty Images)

French AI developer Mistral's co-founder and CEO Arthur Mensch speaks during the opening keynote of Mistral's "AI Now Summit" event at the Carrousel du Louvre in Paris on May 28, 2026. (Photo by STEPHANE DE SAKUTIN / AFP via Getty Images)