"Every 14 days a language dies. By 2100, more than half of the more than 7,000 languages spoken on Earth—many of them not yet recorded—may disappear, taking with them a wealth of knowledge about history, culture, the natural environment, and the human brain" -- National Geographic's Enduring Voices Project
Archived historical records, and audio recordings of remaining speakers, are helping many cultures hold on to their endangered language. Read more about these efforts: