They were trained in efficient and environmentally-friendly farming methods like contour ploughing, agroforestry and cultivation of cover crops as a way of reducing water runoff and hence reducing the chances of landslide occurrence.
Take soil erosion for example: we can control it in a number of ways, among which are ridging and furrowing along contours as in East Africa, contour ploughing and leaving stubble in the fields over winter as the corn farmers of Eastern Canada do, converting arable land to pasture as the Azoreans have done, reforesting as the Icelanders are doing, or, most elaborately of all, constructing terraces as the Incas did.
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