We gnomes, guardians of Mother Earth and her secrets and treasures, didn't have to worry much about this thing called "energy" in the Olden Times. We never even heard of the word until about the 1600s, and then it just meant, uh, the inclination to get up and go.
Getting up and going in those days was a bigger deal than it is now, because you didn't "go" in your house. You went outdoors to the privy or into the bushes. On cold days we called it "breaking frost," and it wasn't a peasant way to start the day. But it was necessary.
Now "energy" has become a primary concern of us gnomes, because you folks discovered fossil fuels and the uses for it, and in a mere two or three centuries used up most of it, creating shortages, oil wars, global warming and the economic impact of $90-a-tank gasoline fill-ups -- none of which we gnomes had ever heard of or imagined in the thousands of years of our existence living under tree roots in the quiet woods.
Now we have to think about "energy" matters all the time, because you madly consuming humans have brought us close to the brink of extinction by your profligate squandering of fuel energy.