In order to determine whether replacing fossil fuels with hydrogen would be good for the environment, what question must be answered? A. How much hydrogen is there on Earth? B. How long will the fossil fuels on Earth last? C. Where would the energy to produce the hydrogen come from? D. What effect does water have on the environment?

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.

its probably to later but whats the question