energa̕ 35 energy 35 fuentes de energa̕ Combustibles 34 Fuels 34 energy sources 34 Combustibles fs̤iles 33 več ... Fossil fuels 33 oil 32 petrl̤eo 32 petroleum 31 gas natural 28 natural gas 28 Industria del petrl̤eo 12 Petroleum industry 12 industria del petrl̤eo 10 oil industry 10 industria petroqum̕ica 9 petrochemical industry 9 Industria petroqum̕ica 7 Petrochemical industry 7 monetizacin̤ de gas natural 7 natural gas monetization 7 oil refining 7 refinacin̤ de petrl̤eo 7 gas hydrates 6 hidratos de gas 6 environment 5 medio ambiente 5 reservorios 5 manj ...