Most believe this mass extinction has been caused by climate change and to an extent, this plays a large role. However, the most devastating loss of biodiversity is caused by urbanisation and forcing animals out of their natural habitats. This event is the result of human encroachment on true wilderness, pressuring our natural ecosystems and shifting organisms to less than optimal geographic ranges. Since 1900, native species have shrunk to 20% in land-based habitats from habitat fragmentation and biproducts thereof, such as soil degradation, deforestation and pollution.
Furthermore, unique to this mass extinction event, we are recording the disappearance of our larger vertebrate species such as whales, sea turtles, and birds. In the last 45 years alone, the vertebrate population has plummeted to 52%. Most species of which are mobile and able to shift their geographic range, yet leave behind sessile species that rely far more heavily on specific environmental conditions.