TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The power producing system further comprises: placement of the fuel cell product stream and the gasifier in thermal communication with one another; a condenser in fluid communication with the fuel cell; and a heat exchanger capable of transferring heat between the gasifier and fuel cell. The gasifier and fuel cell are in physical contact with one another. The fuel cell comprises a solid oxide fuel cell (preferred), a molten carbonate fuel cell and/or a protonic ceramic fuel cell. Preferred Method: In the electrical energy producing method, 1-100 (preferably 10-80) vol.% of the carbon dioxide evolved from the fuel cell is recirculated to the gasifier, and 1-100 (preferably 5-75) vol.% of the fuel product stream is fed to the fuel cell. The electrical energy producing method further comprises: isolating at least a portion of the carbon dioxide present in the second product stream, where the isolation is accomplished by condensing at least a portion of the second product stream; extracting at least a portion of heat contained within the fuel product stream and/or the second product stream; and supplying at least a portion of the extracted heat to the gasifier.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - The gasifier is an indirect or a partial combustion gasifier. The hydrocarbon producing system further comprises: continuous supply of feed material to the gasifier; and a steam reformer, a combustor and/or a fuel cell in fluid communication with the gasifier.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The gasification is performed: at 800-1600 degrees C and 1-72 atmosphere; in the presence of added oxygen, substantially without added oxygen; and by partial oxidation. The gasification is accomplished by a fluidized bed. The method further comprises: adding water to the gasifier; adding steam to the gasifier, where the molar ratio of steam to carbon present in the material introduced to the gasifier is 1:10-5:1; sequestering at least a portion of the carbon dioxide of the second product stream; combining the carbon dioxide of the second product stream conveyed to the gasifier with the feed stream prior to introduction to the gasifier; transporting at least a portion of the carbon dioxide of the syngas product stream to the gasifier such that carbon dioxide constitutes 10-50 vol.% of all material introduced to the gasifier; conveying at least a portion of the carbon dioxide of the second product stream to the gasifier such that carbon dioxide constitutes 20-30 vol.% of all material introduced to the gasifier; addition of hydrogen and/or oxygen to the gasifier; removal of hydrogen and/or oxygen from the gasifier; and transferring to the gasifier heat evolved from further processing the first product stream. The further processing step comprises: sequestering carbon dioxide from the second product stream; deriving a hydrocarbon from the syngas product stream; subjecting the syngas product stream to a Fischer-Tropsch reaction scheme; separating carbon dioxide from the syngas product stream; sequestering carbon dioxide from the syngas product stream; and combustion. The gasification is accomplished by partial oxidation, steam gasification, gasification where indirect heating is provided by solar heating and/or plasma assisted gasification. The step of conveying at least a portion of the second product stream comprises separating carbon dioxide from the second product stream and transporting at least a portion of the carbon dioxide to the gasifier, where at least a portion of the carbon dioxide of the second product stream conveyed to the gasifier enters the gasifier in liquid form, landfill gas is used to generate carbon dioxide through steam reformation, combustion, or processing with a solid oxide fuel cell, and at least a portion of carbon dioxide is introduced to the gasifier. The feed stream is introduced continuously to the gasifier. Preferred Method: The step of introducing the carbon dioxide into the gasifier is performed such that carbon dioxide constitutes 20-30 vol.% of all material introduced to the gasifier, waste gas is used to generate carbon dioxide through steam reforming of the waste gas, combustion of the waste gas, or processing the waste gas with a solid oxide fuel cell, at least a portion of which carbon dioxide is introduced to the gasifier. Preferred Components: The carbonaceous material comprises an organic material, coal and/or biomass. The waste gas comprises landfill gas. The feed stream comprises: coal; a polymer, a plastic and/or a rubber; or sewage sludge, municipal solid waste and/or agricultural waste. EXAMPLE - No suitable example given.