Passage Summary: We use a lot of stuff that doesn't grow back, like metal. Since there's only a limited amount of it on Earth, we will eventually have to stop using it or find a replacement.

Conclusion: Humanity's current reliance on nonrenewable resources will inevitably have to change.

Reasoning: Because nonrenewable resources like metal ore exist in finite quantities, we will eventually run out and be forced to either stop using them or switch to renewable alternatives.

Analysis: The argument hinges on the transition from a physical reality (finite resources) to a necessary change in human behavior. For this conclusion to hold, the argument must assume that we cannot simply continue our current patterns until the very last bit of resource is gone without any change occurring before that point. It also assumes that we won't find a way to create these 'nonrenewable' resources through some yet-to-be-discovered technology. Look for an answer that addresses the necessity of this shift once the supply becomes exhausted or unavailable.