Auzou Book for bears tome 1 back to earth

Earth, a very long time from now. Dominated by evolved bears, divided into clans and castes, in the midst of a conflict that threatens to degenerate into a full-scale war... This is where an interstellar nef arrives containing the last representatives of humans, following the failure of colonization on an exoplanet. Three of them, Ka-rel, Shi-Ma and Onésine, are brought out of hibernation by Celki, the ship's AI, who sends them to scout this planet they know nothing about. Once on Earth, cut off from the mother ship, they will have to navigate between the bear clans who want to use them and their technology in their struggles, and try to understand what has happened on Earth since their departure, to allow the return of the humans and the survival of their species...