Sprachdokumentation; Language documentation; Documentation (method.) ; Ökologie und Sprache; Ecology and language; Umweltschutz; Pollution; Umweltbelastung; Ökolinguistik; Ecolinguistics; Klimawandel; Climate change; Language and ecology ; Sprachentod; Extinct language; Language endangerment; Bedrohte Sprache; Linguicide; Linguizid; Language death ; Somba