First, we are losing the unique ways of life, languages, and identities of the world’s diverse peoples. It’s a matter of human rights. For each one of these peoples, it’s their right to choose their own path for development while maintaining continuity with their own past. It’s their right to “walk toward the future in the footsteps of their ancestors”.
For humanity at large, the loss of cultural and linguistic diversity represents a drastic reduction of our collective human heritage: a profound diminishment of our understanding of what it means to be human—of the thousands of different ways in which we can say, “I am human”. Our horizon as a species becomes all the narrower for that.