Indigenous authoritity Jorge Arevalo shows a stone of sulfur near the Green Lake ("Laguna Verde" in Spanish), in Tuquerres, department of Narino, Colombia on August 29, 2024. In the Andes mountains of south-west Colombia, the crater of a volcano shelters an enchanting lake in fifty shades of green, a natural treasure that was once threatened by mass tourism and is now watched over by an indigenous community. (Photo by JOAQUIN SARMIENTO / AFP)