Questions I couldn't find answers to

Although I answered almost all of my questions, their are still some questions yet to answers. Maybe they were not good questions. Or maybe they were too hard for me to find answers to. They were, why do we need this energy? Is this energy still in development? Is this energy connected to any other energies? Does this energy depend on ant other energies? What can we do to conserve this energy? Are their safer ways to get his energy? If it is, how do we know that this energy is changing?