instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Renewable energy sources emit fewer or no greenhouse gases.
answer:
What type energy sources emit fewer or no greenhouse gases?

question:
The best way humans can conserve water is to use less.
answer:
What's the best way humans can conserve water?

question:
Prior to birth, the lungs are filled with amniotic fluid, mucus, and surfactant else.
answer:
Prior to birth, the lungs are filled with amniotic fluid, mucus, and what else?