How could energy be beneficial to human kinds?

Science is like the tool for solving our everyday life's problems: if there are no problems in our life, so there will be no need of science. Why need tools when we could handle it ourself?
About your question, suppose you live in Newtonian era, you'll in no need of energy. People live in that era even have no concept about energy! But you live in Einsteinian or Bohrian era. In this era, you at least should understand the concept of energy,. That's it, you should realizing how beneficial energy is to human kinds! To do that, no answer on my side will help except you experience it yourself. As old saying say, experience is the best teacher, so you need to teach yourself with your own expereince. Teach about what? About how energy is so beneficial to human kinds! But, how? I don't know how. You find the way yourself..