> If raging population and economic growth don’t cause important resources to be depleted Someone else talked about substitutes so I'll point out that "raging

> If raging population and economic growth don’t cause important resources to be depleted Someone else talked about substitutes so I'll point out that "raging population and economic growth" doesn't imply that you're anywhere near depletion. It merely says that you're headed that way. Consider atmospheric O2. We've got billions more people today than we had 200 years ago, but we're still not anywhere near depletion. All the numbers and units matter, not just derivatives, and especially not derivatives without units.