Most of the activities that we carry out every day require the use of one form of energy or another. On average, every person living on planet Earth consumes 2500W  of primary energy (energy resources that have not suffered any transformation). In one year this adds up to 75 million Btu’s (around 79 gigajoules) per person, which is enough energy to drive a modern diesel car around the Earth by the Equator.
Many mornings, we wake up by the light and the warmth of the Sun, our star. Located at the center of the Solar System, it provides the necessary energy to enable life in the biosphere. Also, it participates in the lifecycle of several renewable resources which are the origin of hydro, wind, marine and geothermal power, and biomass.