Etymology
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desertification (n.)

"process of becoming or making into a desert," especially "the turning of fertile land into arid waste as a result of human activity," 1973, from desert (n.1) + -fication "a making or causing." In French, désertisation is attested from 1968.

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Definitions of desertification

desertification (n.)
the gradual transformation of habitable land into desert; is usually caused by climate change or by destructive use of the land;
the dust storms in Korea are the result of rapid desertification in China
From wordnet.princeton.edu