What is the sixth mass extinction and what can we do about it?

The planet has experienced five previous mass extinction events, the last one occurring 65.5 million years ago. Experts now believe we’re in the midst of a sixth mass extinction.The planet has experienced five previous mass extinction events, the last one occurring 65.5 million years ago which wiped out the dinosaurs from existence. Experts now believe we’re in the midst of a sixth mass extinction.