The dried up Rusanda salty lake, of which its mud is used in medical therapy, near Melenci, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
The dried out Bileca lake, near the town of Bileca, Bosnia, Thursday, Sept. 5, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Eldar Emric)
The dried out Bileca lake, near the town of Bileca, Bosnia, Thursday, Sept. 5, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Eldar Emric)
Wilted sunflowers in a field near the town of Becej, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
Wilted sunflowers in a field near the town of Becej, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
The dried out Rusanda salty lake of which its mud is used in medical therapy, near Melenci, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
The dried out Rusanda salty lake, whose mud is used in medical therapy, near Melenci, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
The dried up Bileca lake, near the town of Bileca, Bosnia, Thursday, Sept. 5, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Eldar Emric)
The dried out Bileca lake, near the town of Bileca, Bosnia, Thursday, Sept. 5, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Eldar Emric)
Wilted sunflowers in a field near the town of Becej, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
A man collects mud that is used in medical therapy at the dried out Rusanda salty lake, near Melenci, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
The Rusanda salty lake, of which its mud is used in medical therapy, has dried out completely, near Melenci, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
A man collects mud to be used in medical therapy from the Rusanda salty lake that has dried out completely, near Melenci, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
A man collects mud that is used in medical therapy at the dried out Rusanda salty lake, near Melenci, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
Freshwater shells on a dry bank of the dried out Bileca lake, near the town of Bileca, Bosnia, Thursday, Sept. 5, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Eldar Emric)
The dried out Rusanda salty lake whose mud is used in medical therapy, near Melenci, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)
A man collects mud that is used in medical therapy from the Rusanda salty lake that has dried out completely, near Melenci, Serbia, Wednesday, Sept. 4, 2024. Experts say the summer of 2024 in the Balkans was the hottest since measurements started more than 130 years ago. (AP Photo/Darko Vojinovic)