Semi-arid is perfectly compatible with agriculture. In fact, many of the earliest sites for agriculture around the world are found in arid or semi-arid environm

Semi-arid is perfectly compatible with agriculture. In fact, many of the earliest sites for agriculture around the world are found in arid or semi-arid environments. I'd suggest reading Dennell's paper on the deserts of Asia. https://doi.org/10.1016/j.quaint.2012.12.002 https://doi.org/10.1016/j.quaint.2012.12.002