About 5,500 years ago, there was a shift from savannah to desert vegetation in the Sahara. Conceptual modelling suggests that the transition was controlled by a climate–vegetation feedback that was also influenced by plant diversity.
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Dekker, S. Biodiversity-dominated feedback. Nature Geosci 6, 903–904 (2013). https://doi.org/10.1038/ngeo1989
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DOI: https://doi.org/10.1038/ngeo1989