végétation (1) pression (1) pollen (1) lac (1) ivoire (1) glace (1) chasse (1) herbivore (1) pâturage (1) pêche (action) (1) incendie (1) environnement (1) donnée environnementale (1) Groenland (1) Area (1) Commerce (1) Antiquities, Prehistoric (1) Paleoecology--Pleistocene (1) Area (1) Willows (1) Walrus (1) Values (1) Tenth century (1) Strategy (1) Societies (1) Science (1) Ruins (1) Records (1) Pressure (1) Pollen (1)