Energa̕ Energy 125 Fuentes de energa̕ 33 Energy sources 32 Gas natural 25 Natural gas 25 energa̕ 23 more ... energy 23 Energa̕ solar 22 Solar energy 22 Petrl̤eo 21 Combustibles 20 Environment 20 Fuels 20 Medio ambiente 20 Efficiency 19 Eficiencia 19 eficiencia energťica 14 energy efficiency 14 Combustibles fs̤iles 12 Energa̕s renovables 12 Fossil fuels 12 Renewable energies 12 Celdas fotovoltaicas 11 Oil 11 Photovoltaic cells 11 Petroleum 9 Celdas solares 8 Energy efficiency 8 Generacin̤ de energa̕ 8 less ...