From ultra-modern Manhattan penthouses to cell phones and radios in sub-Saharan homes, from private jets zipping over the oceans to motor scooters in southeast Asia - we require energy to power our lives. At this point, only protected Amazon tribes and the few humans who have chosen to live off the energy grid do not use any of the world's energy supplies.
Overall, we humans use in excess of 500 exajoules of energy per year. The energy we produce is derived by a variety of sources such as nuclear; fossil fuels, including coal, crude, and gas; and renewables such as wind, hydro, and solar. These fuels are broken into two main types of use, the first is locomotion via fuel burning engines and the second is the creation of electricity, which is then used as a source of power for motors, lights, appliances, and the gadgets we use (to name a few).