Earth’s 5 Biggest Mass Extinctions

Earth’s 5 biggest mass extinctions. In this video we countdown earth’s 5 biggest mass extinctions. The earth has undergone numerous mass extinctions since the first bacterial life evolved about three billion years ago, and we are facing a potential 11th extinction as global warming threatens to disrupt our planet’s ecosystems. In this video we countdown the 5 biggest earth mass extinctions. Thank you for watching! Thank you to for the background music!