Adobe is one of the oldest building materials in continuous use. It is simply a mixture of clay-rich soil, water, and organic fiber (straw, grass, or dung) formed into bricks and dried in the sun. No firing, no chemical treatment, no industrial processing. Adobe construction has been practiced for at least 10,000 years on every inhabited continent. In arid and semi-arid climates — the American Southwest, the Middle East, North Africa, Central Asia — adobe is exquisitely suited to the climate. Its high thermal mass stores solar heat during the day and releases it at night, moderating the extreme diurnal temperature swings that characterize desert environments. Its porosity allows it to absorb and release moisture, contributing to the regulation of interior humidity. Its earthy texture and color connect the building to its landscape. Adobe’s primary limitation is moisture sensitivity. Unbaked clay dissolves in rain, which is why adobe buildings in…