In The Guardian, Peter K. Austin, author of One Thousand Languages: Living, Endangered and Lost, introduces his selections for the top 10 endangered languages in the world today:
There are more than 6,900 languages used around the world today, ranging in size from those with hundreds of millions of speakers to those with only one or two. Language experts now estimate that as many as half of the existing languages are endangered, and by the year 2050 they will be extinct. The major reason for this language loss is that communities are switching to larger politically and economically more powerful languages, like English, Spanish, Hindi or Swahili.
Austin then outlines four criteria that influenced his choices: geographical coverage, scientific interest, cultural interest and social impact.