Forget the "zero sum" cr*p:
Minerals on the Ocean floor could provide resources for over 60 centuries: "With the necessary precautions, extracting the underwater deposits may also be a more environmentally friendly process than mining on land, Cathles said.
And it could provide other benefits, both scientific and psychological. Undersea exploration around ocean ridges could open doors to new research on the fundamental processes behind the formation of Earth's crust, he noted; and a more positive outlook on the future could lead to fewer wars and more positive engagement.
'We are not resource limited on planet Earth. For a human on Earth to complain about resources is like a trillionaire's child complaining about his allowance or inheritance. It just doesn't have much credibility in my view,' he said."