A zombie apocalypse is right around the corner if you believe anything the Walking Dead has to say. And with the rise of post-apocalyptic storytelling in Young Adult literature (Hunger Games, Divergent, Matched, etc.), it’s hard not to think about what would happen if a major catastrophe hit our little blue planet. Our friends over at ASAP Science took the idea one step further. They asked the question: What if all the humans disappeared? See what they have to say after the break.