Energy sources Fuentes de energa̕ 120 Energa̕ 89 Energy 88 Gas natural 54 Natural gas 54 Combustibles 46 больше ... Fuels 46 Petrl̤eo 46 Environment 30 Medio ambiente 30 Oil 28 Combustibles fs̤iles 23 Fossil fuels 23 Petroleum 19 Industria del petrl̤eo 18 Petroleum industry 18 Power technology 18 Tecnologa̕ energťica 18 Petroleum refining 17 Refinacin̤ del petrl̤eo 17 renewable energy 16 energa̕ renovable 15 Monetizacin̤ de gas natural 14 Petroleum technology 14 Tecnologa̕ del petrl̤eo 14 Generacin̤ de energa̕ 12 Power generation 12 Recursos energťicos renovables 12 Renewable energy sources 12 меньше ...