A thick fog flows over the eastern range of the Colombian Andes. Here and there, the constant wind lifts the clouds to reveal lagoons, cloud forests, and páramo, an Andean alpine ecosystem known as a “mountain-top sponge” for its massive water-holding capacity. Descending lower into the Upper Magdalena Valley, about 400 kilometers southwest from Bogotá, rural communities farm a wide variety of fruit and vegetable crops, and raise animals that not only sustain families, but help feed Colombia´s major cities.