Abstract Africanists have been criticized by comparative linguists working on language families in other parts of the world for being lumpers. The present contribution reviews current views among specialists on genetic diversity on the African continent. In addition, some of the causal mechanisms behind this language diversity are investigated. More specifically, the role played by innovations in subsistence economies and climatological changes is discussed. Special emphasis, however, is put on attitudes towards the role of language as a marker of social identity and their effect on language diversity.
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