In a small clapboard house on the outskirts of Oaxaca, Mexico, an eighty-four-year-old woman named Concepcion Vasquez is one of the last fluent speakers of Zapotec Miahuatec, a language that has been spoken in these mountains for more than two thousand years. When she dies, a unique way of understanding the world will very likely die with her.

Her situation is far from unique. According to UNESCO, roughly half of the world's seven thousand languages are in danger of disappearing within the next century. One language falls silent approximately every two weeks, taking with it irreplaceable knowledge about human cognition, history, and the natural world.

But a growing movement of linguists, technologists, and indigenous communities is fighting back. The Endangered Languages Project, a collaboration between Google and the First Peoples Cultural Council, has created a digital platform where speakers can upload recordings, texts, and videos in their native languages, building an archive that will outlast even the last speaker.

"A language is not just a set of words and grammar rules," said Dr. K. David Harrison, a linguist at Swarthmore College and one of the project's advisors. "It is an entire system for encoding knowledge. When a language dies, we lose a library."

The causes of language death are well documented. Globalisation, urbanisation, and the dominance of a handful of major languages in education and media all push speakers toward more widely used tongues. Children grow up speaking the language of economic opportunity rather than the language of their grandparents.