beach erosion ozone depletion overfishing air pollution
I gave my students this multiple choice question: Coal is used for generating about 53% of the electrical energy in the United States. Which of these environmental issues is directly contributed to by the burning of coal?

Only one answer is correct among these 4 choices:
- beach erosion
- ozone depletion
- overfishing
- air pollution

Could you tell me which one is correct?

air pollution