Energa̕ Energy sources Fuentes de energa̕ 89 Energy 88 Gas natural 51 Natural gas 51 Petrl̤eo 44 mere ... Combustibles 39 Fuels 39 Environment 27 Medio ambiente 27 Oil 26 Petroleum 19 Combustibles fs̤iles 16 Fossil fuels 16 Petroleum refining 16 Refinacin̤ del petrl̤eo 16 Industria del petrl̤eo 14 Monetizacin̤ de gas natural 14 Petroleum industry 14 Power technology 13 Tecnologa̕ energťica 13 Petroleum technology 12 Tecnologa̕ del petrl̤eo 12 Industria petroqum̕ica 11 Petrochemical industry 11 Hidrotratamiento 10 Hydrocracking 10 Hydrotreatment 10 Natural gas monetization 10 mindre ...