Combustibles Energa̕ 20 Energy Fuels 20 Fuentes de energa̕ 19 Energy sources 18 Gas natural 15 more ... Natural gas 15 Petrl̤eo 14 Combustibles fs̤iles 10 Fossil fuels 10 Oil 9 Industria del petrl̤eo 6 Petroleum industry 6 Monetizacin̤ de gas natural 5 Environment 4 Industria petroqum̕ica 4 Medio ambiente 4 Petrochemical industry 4 Petroleum 4 Exploracin̤ 3 Exploration 3 GNL 3 Gas hydrates 3 Gas natural licuado 3 Hidratos de gas 3 Hydrate prediction 3 LNG 3 Liquefied natural gas 3 Natural gas monetization 3 less ...