We need some scientists who have studied the totality of life on earth. As I understand it, everything is in a constant cycle of birth, death and renewal. To include changes from solid to gas and liquid and back to solids over and over again. Cycled by plants and animals eating, urinating etc., Even rocks get renewed by wearing down into sand, combining with other materials, acids and back into solid forms.
Of course, I could be wrong;)
We are a closed loop system.