" Yes, the worst parasites. We reproduce with no internal limitations. We consume and destroy and make war. We have no predator except ourselves, and left unchecked we destroy ourselves every time. And we destroy the planet along with us. Humankind is the thing that must be contained. Man must be checked. We were nature’s mistake—the only species worth extinction is our very own. "

― Ryan Winfield , The Park Service (Park Service Trilogy, #1)