Reverse desertification is very doable, IMHO. From the ocean shores - a combination of passive water trapping engineering, akin to what the British did here: h

Reverse desertification is very doable, IMHO. From the ocean shores - a combination of passive water trapping engineering, akin to what the British did here: https://news.nationalgeographic.com/2017/05/ascension-island-terraformed-biology-evolution-conservation/ https://news.nationalgeographic.com/2017/05/ascension-island... edit: as well as active Seawater greenhouses at the shores with humid air pumped: https://en.wikipedia.org/wiki/Seawater_greenhouse https://en.wikipedia.org/wiki/Seawater_greenhouse Attacking the sand dunes themselves - pin them down so less sand gets blown around. Solar powered rovers can roam the dunes and sinter (with concentrated light) long reams in a pattern in the dunes. This will slow down dune movement both in the short term - what is held down by the sintered reams of glass, can not blow around - but also in the long run - when new sand inevitably blows over the reams of glass, the reams will remain inside the dune, acting as a structural enforcement - rebar in effect, stabilizing the whole dune. Rinse, repeat. Perhaps the roaming rovers can even etch mini-structures into the sand giving local shadow which can trap moisture.