Combustibles fs̤iles 23 Energy sources Fossil fuels Fuentes de energa̕ 23 Combustibles 22 Fuels 22 Energa̕ 16 more ... Energy 15 Industria del petrl̤eo 15 Petroleum industry 15 Petrl̤eo 14 Oil 11 Gas natural 8 Natural gas 8 Industria petroqum̕ica 7 Petrochemical industry 7 Environment 6 Medio ambiente 6 Upstream 6 Oil production 5 Petroleum 4 Produccin̤ de petrl̤eo 4 Emisiones 3 Emissions 3 Exploracin̤ 3 Exploration 3 Greenhouse gases 3 Operaciones 3 Operations 3 Procesos 3 less ...