@Ericka Nature already does compost piles in the woods! And they don't spontaneously combust! Part of the reason the forest floor is normally so rich in nutrients (as long as sunlight can be added to the mix). Everything that lives in the woods eventually dies in the woods and ends up on the forest floor where it rots and goes back to dust... Even old cars, bottles, trash, you name it, that people have thrown in the woods will eventually disintegrate. Just a matter of how much time is required for it to happen. I wouldn't add flammable items though, like oil soaked rags, gasoline, etc. 
