The Earth's Volume

All of the resources humanity has used in millennia of consumption and exploration are about a tiny fraction of the bounty available on earth. The deepest hole ever dug in its crust would be 0.027 cm or 0.011 inch deep, less than the thickness of three pages of this book. If 8 billion people can subsist on the equivalent of a half cup out of an Olympic pool, it is clear that the total magnitude of water in the pool is irrelevant to human life and all economic considerations.