Living in close relationship with the Siberian environment, for several decades the Tungus (Evenk and Even peoples) have been noticing numerous changes in climate, flora and fauna. Based on fieldwork among reindeer herders, hunters and fishermen in Yakutia, the Amur region and Kamchatka, this paper explores how climate change is perceived, and how it causes economic, social and ritual changes. It questions the modifications of the economic and religious human-environment relationships through various aspects. It analyses the indigenous perception of a link between the environment and identity and the indigenous notion of adaptation and vulnerability. It also compares their adaptive strategies that either use old techniques, or trigger mutations. In this context, the notion of reciprocity seems to be disappearing and a new notion of time-space in managing the environment is appearing. This paper analyses the religious changes, such as the creation of new rituals and millenarian narratives or the rebirth of shamanistic legends.