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The language revolution
I did feel sometimes that Crystal sometimes seemed to be standing back from the action - maybe it's because the book is essentially a summary of three larger ones. For instance he urges the provision of funds for the prevention of language death, and he suggests that artistic works should be created which raise awareness of the problems, but there isn't much of the specifics of those languages which are in danger. On the other hand, if a concise book is what you want, then this is a good place to learn about some of the changes to language which may occur in the coming decades.