I can think of several species we've run out of. (We also came very close to running "out of" ozone over a large part of our planet. The idea that a resource i

I can think of several species we've run out of. (We also came very close to running "out of" ozone over a large part of our planet. The idea that a resource is "done" only when it's been utterly depleted isn't how it goes in practice.)