And then there are watt hours, the time the watts are needed to do whatever needs to be done. So added fuel consumption over that length of time. There is also a loss caused by inefficiency & friction every time we change from one power source to another. I guess that could be part to the alternator efficiency rating.
I think that to fully understand modern energy needs we will have to return to the Stone Age because every advance from there required greenhouse gas producing fuel. With today's population deforestation issues wipe out the oxygen producing plants very quickly. No fossil fuels = no metal. We are in a pickle!
