Mother Earth is one seriously gracious host. Humanity has done little else to the planet that produced us than completely destroy it at every turn. We dump toxic oil into oceans, irreversibly alter the climate, drive species into extinction, and pile heaps of trash everywhere we can find space for it. Nature owes us nothing, but it still finds a way to help us save our own hides on a regular basis. The latest example? How about a caterpillar that eats and breaks down the one thing humans have created that pollutes for centuries before decomposing on its own: plastic.