A fan blows air inside the the Grant Museum of Zoology, in London on June 26, 2026. where they are having to monitor the temperatures inside the display cases, during the heatwave. As visitors peered at the skeletons and preserved animals at a London zoological museum during the latest heatwave, staff were focused on a different attraction: a computer screen glowing with red and green temperature indicators. With each one linked to a sensor in a different display case, the system allows staff to see when an exhibit is in danger of overheating. (Photo by CARLOS JASSO / AFP via Getty Images) / TO GO WITH AFP STORY BY HELEN ROWE

(FILES) French-Malian singer Aya Nakamura performs on stage during the 35th edition of the Francofolies Music Festival in La Rochelle, southwestern France, on July 12, 2019. Despite the new heatwave sweeping across France, a host of major artists are sure to raise the temperature even further for the 150,000 attendees of the 42nd edition of the Francofolies. Aya Nakamura, Orelsan, Mika or the band Feu ! Chatterton, among others, will be performing in La Rochelle from July 10 to 14, 2026. Against a backdrop of intense summer heat, no major changes are on the agenda for the festival organizers, who remain in close contact with local authorities. (Photo by XAVIER LEOTY / AFP via Getty Images)

(FILES) French singer Orelsan performs during the 34th edition of the Francofolies Music Festival in La Rochelle, southwestern France, on July 14, 2018. Despite the new heatwave sweeping across France, a host of major artists are sure to raise the temperature even further for the 150,000 attendees of the 42nd edition of the Francofolies. Aya Nakamura, Orelsan, Mika or the band Feu ! Chatterton, among others, will be performing in La Rochelle from July 10 to 14, 2026. Against a backdrop of intense summer heat, no major changes are on the agenda for the festival organizers, who remain in close contact with local authorities. (Photo by XAVIER LEOTY / AFP via Getty Images)

(FILES) French singer Arthur Teboul of the band Feu ! Chatterton performs during the 32nd Francofolies Music Festival in La Rochelle, southwestern France on July 15, 2016. Despite the new heatwave sweeping across France, a host of major artists are sure to raise the temperature even further for the 150,000 attendees of the 42nd edition of the Francofolies. Aya Nakamura, Orelsan, Mika or the band Feu ! Chatterton, among others, will be performing in La Rochelle from July 10 to 14, 2026. Against a backdrop of intense summer heat, no major changes are on the agenda for the festival organizers, who remain in close contact with local authorities. (Photo by XAVIER LEOTY / AFP via Getty Images)

(FILES) French-Israeli singer Yael Naim performs during the 31st Francofolies Music Festival in La Rochelle on July 13, 2015. Despite the new heatwave sweeping across France, a host of major artists are sure to raise the temperature even further for the 150,000 attendees of the 42nd edition of the Francofolies. Aya Nakamura, Orelsan, Mika or the band Feu ! Chatterton, among others, will be performing in La Rochelle from July 10 to 14, 2026. Against a backdrop of intense summer heat, no major changes are on the agenda for the festival organizers, who remain in close contact with local authorities. (Photo by Xavier LEOTY / AFP via Getty Images)

(FILES) French singer Maitre Gims performs on stage at the Francofolies Music Festival in La Rochelle on July 14, 2016. Despite the new heatwave sweeping across France, a host of major artists are sure to raise the temperature even further for the 150,000 attendees of the 42nd edition of the Francofolies. Aya Nakamura, Orelsan, Mika or the band Feu ! Chatterton, among others, will be performing in La Rochelle from July 10 to 14, 2026. Against a backdrop of intense summer heat, no major changes are on the agenda for the festival organizers, who remain in close contact with local authorities. (Photo by XAVIER LEOTY / AFP via Getty Images)

(FILES) Festivalgoers attend the 41st edition of Francofolies de la Rochelle 2025 in La Rochelle, southwestern France on July 12, 2025. Despite the new heatwave sweeping across France, a host of major artists are sure to raise the temperature even further for the 150,000 attendees of the 42nd edition of the Francofolies. Aya Nakamura, Orelsan, Mika or the band Feu ! Chatterton, among others, will be performing in La Rochelle from July 10 to 14, 2026. Against a backdrop of intense summer heat, no major changes are on the agenda for the festival organizers, who remain in close contact with local authorities. (Photo by Philippe LOPEZ / AFP via Getty Images)

(FILES) Mika performs live at the Francofolies Music Festival in La Rochelle, southwestern France on July 13, 2016. Despite the new heatwave sweeping across France, a host of major artists are sure to raise the temperature even further for the 150,000 attendees of the 42nd edition of the Francofolies. Aya Nakamura, Orelsan, Mika or the band Feu ! Chatterton, among others, will be performing in La Rochelle from July 10 to 14, 2026. Against a backdrop of intense summer heat, no major changes are on the agenda for the festival organizers, who remain in close contact with local authorities. (Photo by XAVIER LEOTY / AFP via Getty Images)