When more trees are harvested than are replanted. When trees are harvested and replanted at the same rate. When trees are used as an energy resource. When trees are used as a material resource.
I gave my students this multiple choice question: When is wood a nonrenewable resource?

Only one answer is correct among these 4 choices:
- When more trees are harvested than are replanted.
- When trees are harvested and replanted at the same rate.
- When trees are used as an energy resource.
- When trees are used as a material resource.

Could you tell me which one is correct?

When more trees are harvested than are replanted.