The city of Cali is pictured from the Alto del Huey base at Farallones Natural park near Cali, Valle del Cauca, Colombia on November 29, 2024. In the mountains, often covered in fog, irregular armed groups have been profiting for half a century from illegal gold mining using mercury, a heavy metal that pollutes the water of 2.2 million inhabitants of the city of Cali. (Photo by JOAQUIN SARMIENTO / AFP)