A person sits in the shade of trees in a nearly empty park in Los Angeles, Friday, July 31, 2026. (AP Photo/Jae C. Hong)

Daniel Aragonez leaves a cooling center in Los Angeles, Friday, July 31, 2026. (AP Photo/Jae C. Hong)

Pedestrians try to stay in the shade was they walk through misting machines at an outdoor mall, Friday, July 31, 2026, in Scottsdale, Ariz. (AP Photo/Ross D. Franklin)

Embers smolder inside an olive tree during a wildfire in the Rethymno region on the southern Greek island of Crete, Wednesday, July 29, 2026, where two firefighters died while battling the blaze. (AP Photo/Giannis Angelakis)

Polar bear cools down on a pile of ice that was brought to its enclosure on a hot and sunny day at the Zoo in Prague, Czech Republic, Thursday, July 30, 2026. (AP Photo/Petr David Josek)

Polar bear cools down on a pile of ice that was brought to its enclosure on a hot and sunny day at the Zoo in Prague, Czech Republic, Thursday, July 30, 2026. (AP Photo/Petr David Josek)

Polar bears cool down as an ice bath and a pile of ice was brought to theirs enclosure on a hot and sunny day at the Zoo in Prague, Czech Republic, Thursday, July 30, 2026. (AP Photo/Petr David Josek)

Polar bears cool down on a pile of ice that was brought to theirs enclosure on a hot and sunny day at the Zoo in Prague, Czech Republic, Thursday, July 30, 2026. (AP Photo/Petr David Josek)