converting sunlight into electricity looking for new coal reserves finding reservoirs that contain oil converting forests into farmland
I gave my students this multiple choice question: Which topic area would be the best to research to find ways of reducing environmental problems caused by humans?

Only one answer is correct among these 4 choices:
- converting sunlight into electricity
- looking for new coal reserves
- finding reservoirs that contain oil
- converting forests into farmland

Could you tell me which one is correct?

converting sunlight into electricity