Biodiversity in the Sixth Mass Extinction. The sixth mass extinction currently underway is due to a combination of climate change and destruction of natural habitats. Both crises are the result of our energy, industrial, and food production systems that have upended Nature. Biologist Michael Reed explains how the vitality of our planet depends on the health of ecosystems. Using migratory birds as an example, he describes the interdependence of different forms of life: birds, animals, fish, insects, plants and terrain. Dr. Reed also suggests why some species are better able to adapt to the climate and extinction crises than others. 00:25:00