Prologue 1. The Diversity of Languages 2. Interpreting Language Diversity 3. Multilingual Abilities 4. The Emergence and Measurement of Multilingualism 5. The Consequences of Babel: Lingua Francas 6. The Consequences of Babel: Translation 7. Keeping Languages Pure 8. Languages and Identities in Transition 9. Endangered Languages and the Will to Survive 10. Linguistic Intervention and the New Ecology of Language Epilogue Bibliography Index.
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A 2012 study studied this question.