Observation 1.3: Astronomy Cast Ep. 220 (Mass Extinctions)

This episode talked about mass extinction events, and the various extinction events that have occurred throughout the history of our planet. There have been five of these, the most well known being the Cretaceous-Tertiary extinction event. Known also as the KT event, this extinction led to the death of the dinosaurs, and was most probably caused by a large asteroid impact. Particularly interesting is the idea presented in the podcast that we are currently experiencing a sixth great extinction, as a result of human influences on the planet.