Dust bowl: symptoms of desertification
The dust bowl was a critical problem in the 1930’s US where large clouds of dust formed over the great plains, accelerating erosion and diminishing agricultural production. Scientist believe it could repeat again with higher likelihood of droughts brought by climate change, and expansion of crops over areas where the soils are already vulnerable. A really nice overview of recent literature is summarised in this Science note.
Critical Transitions 
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