Every mammal on this planet instinctively develops a natural equilibrium with the surrounding environment. But you humans do not. You move to an area, and you multiply and multiply, until every natural resource is consumed. The only way you can survive is to spread to another area. There is another organism on this planet that follows the same pattern.
Human beings are a disease.
A cancer of this planet. You are a plague. And we are the cure. Personally I'm am very excited about this. Many may think that BFD won't be ready then and Rare wanted to hold out longer.