A look on energy, renewable energies, energy storage and synthetic fuels, hybrid architecture, fuel cells, hydrogen as a vector of energy of the Earth resources are quite limited in quantity Many challenges to mankind in 21st century: development, health, water, food, demography, education, physics, energy (Ancient Greek: ἐνέργεια energeia "activity, operation"[1]) is a quantity that is often understood as the ability a physical system has to produce changes on another physical system.[2][3] The changes are produced when the energy is transferred from a system to another. A system can transfer energy by means of three ways, namely: physical or thermodynamical work, heat transfer, or mass transfer. .
