It can. Desertification is a real problem that will eventually have to taken seriously by every mainland country near deserts. One of China's oldest and iconic city's itself is being covered by sand and experiences more sandstorms more frequently than ever before. Look up Dunhuang city on youtube.
The Sahara desert is the source of many nutrients in the Amazon, even though it's across the Atlantic. As the Sahara grows, the Amazon becomes more fertile, so, yes, deserts can do good for the planet.
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