This article examines how the ideological and material aspects of ‘purity’ play out in the environmental conflict in the Białowieża Forest that took place in Poland in 2017. I consider how ‘purity’ informs not only environmental politics but also organizes biopolitical regimes that normalize the hegemonic understanding of nation, identity, and gender. In the context of environmental change and species extinction, I pick up on Foucault’s reflection on purity and its decisive role in biopolitical societies, as it divides lives into those worth preserving and those without a future. Against such divisions, I search for ways to imagine and enact ways of surviving together: I look at the Białowieża Forest as a human-nonhuman ecology in which nature’s lively impurity inspires the affinities running between environmental actions and feminist struggles for more just futures.