very little energy is produced. ecosystems can be damaged. it contains harmful bacteria. it is a very rare resource.
I gave my students this multiple choice question: Many communities in the United States use coal to produce electricity. One problem with using coal is that

Only one answer is correct among these 4 choices:
- very little energy is produced.
- ecosystems can be damaged.
- it contains harmful bacteria.
- it is a very rare resource.

Could you tell me which one is correct?

ecosystems can be damaged.