Combustibles 2 Combustibles fs̤iles 2 Fossil fuels 2 Fuels 2 energa̕ 2 energy energy sources 2 plus ... fuentes de energa̕ 2 gas hydrates 2 gas natural 2 hidratos de gas monetizacin̤ de gas natural 2 natural gas 2 natural gas monetization 2 oil 2 petrl̤eo 2 petroleum 2 reservoirs 2 reservorios 2 Biocombustibles 1 Energy sources 1 Fuentes de energa̕ 1 biofuels 1 calentamiento global 1 caracterizacin̤ ss̕mica 1 environment 1 gases invernadero 1 global warming 1 greenhouse gases 1 medio ambiente 1 moins ...