Our quality of life depends, among other things, on a reliable supply of energy at an affordable price. We use energy to heat and cool our homes, to cook and preserve our food, to travel and to build schools, hospitals and roads. We use machines to carry out numerous tasks, contributing to our wealth and wellbeing, and machines need energy. We still burn fossil fuels to obtain most of the energy we use. Moreover, we waste a substantial part of this energy before and during use. (Fuente: EEA)