 Biodiversity loss, loss of biodiversity or biodiversity loss is the extinction of species plant or animal worldwide, and also the local reduction or loss of species in a certain habitat. The latter phenomenon can be temporary or permanent, depending on whether the environmental degradation that leads to the loss is reversible through ecological restoration slash ecological resilient or effectively permanent e.g. through land loss. Global extinction has so far been proven to be irreversible. Even though permanent global species loss is a more dramatic phenomenon than regional changes in species composition, even minor changes from a healthy stable state can have dramatic influence on the food web and the food chain in so far as reductions in only one species can adversely affect the entire chain. Co-extinction leading to an overall reduction in biodiversity, possible alternative stable states of an ecosystem notwithstanding ecological effects of biodiversity are usually counteracted by its loss. Reduced biodiversity in particular leads to reduced ecosystem services and eventually poses an immediate danger for food security, also for humankind.