is a good way to earn money. produces more carbon dioxide for plants. decreases the amount of natural resources. is a way of conserving nonrenewable resources.
I gave my students this multiple choice question: Recycling is important to the environment because it

Only one answer is correct among these 4 choices:
- is a good way to earn money.
- produces more carbon dioxide for plants.
- decreases the amount of natural resources.
- is a way of conserving nonrenewable resources.

Could you tell me which one is correct?

is a way of conserving nonrenewable resources.