France, May 25 -- There are around 7,000 languages spoken in the world, but that number is shrinking. Unesco estimates that half could disappear by the end of the century. So how are languages lost, and what does that mean for the people who speak them?

Despite the thousands of languages, just 20 or so dominate the global linguistic landscape. Mandarin, Spanish, English, Hindi, Arabic, Portuguese, Bengali, Russian, Japanese, Javanese, German, Wu, Korean, French, Telugu, Marathi, Turkish, Tamil, Vietnamese and Urdu are the mother tongues of more than 3 billion people.

The vast majority of languages on Earth - 95 percent - are actually spoken by just 5 percent of the world's population. And these are the ones that are in danger - threaten...