My feeling is that there is already widespread knowledge ABOUT endangered languages, as the new UNESCO Decade on the same topic shows. What's missing is not facts about different categories of endangerment, or numbers about X versus Y, but intelligent ideas about how to solve the problem (if it is really an existential problem) of how to maintain or sustain or revitalize endangered languages. The problem is huge and often poorly explained. We need good arguments about what it means to benefit from the content from these languages and embrace a green, inclusive, yet exponentially data-driven future.