OBSOLETE: 6th Mass Extinction
There have been five past mass extinctions during the history of Earth. We have entered a 6th mass extinction. The 6th mass extinction (also referred to as the Anthropocene extinction) is an ongoing current event where a large number of living species are threatened with extinction or are going extinct because of the environmentally destructive activities of humans. This article presents an overview of Earth's five past mass extinctions, an overview of the current 6th mass extinction, current and future rates of species extinction associated with the ongoing 6th mass extinction, and past and present human activities associated with the 6th mass extinction.