NOVELTY - Processing a carbonaceous material, comprises: introducing a feed stream comprising a carbonaceous material into a gasifier; at least partially gasifying at least a portion of the carbonaceous material to give rise to a syngas product stream comprising at least carbon monoxide; processing the syngas product stream to give rise to a second product stream comprising at least carbon dioxide; and conveying at least a portion of the carbon dioxide of the second product stream to the gasifier such that carbon dioxide constitutes 10-50 vol.% of all the material introduced to the gasifier.    USE - The method is useful for producing ammonia, a plastic, a polymer, a cellulosic polymer, a solvent, a resin, naphtha, a wax, an alcohol, ethylene, acetate, propylene and/or a hydrocarbon, which is useful in a fuel cell to produce electrical power and in a traditional combustion process (all claimed).    ADVANTAGE - The methods and devices are capable of converting carbonaceous material, such as waste to energy.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a system for producing a hydrocarbon from a carbonaceous material, comprising: a gasifier having at least one inlet and one outlet, in which the outlet of the gasifier is in fluid communication with a combustion chamber, and the combustion chamber emitting a product stream comprising at least carbon dioxide; a conduit placing at least a portion of the carbon dioxide emitted from the combustion chamber in fluid communication with the inlet of gasifier; and a controller capable of modulating the carbon dioxide entering the gasifier such that the carbon dioxide entering the gasifier represents 10-50 vol.% of all material entering the gasifier;    (2) a system for producing power, comprising: a gasifier having at least one inlet and one outlet, in which the outlet of the gasifier is in fluid communication with a fuel cell capable of emitting a product stream comprising at least carbon dioxide; a conduit placing at least a portion of the carbon dioxide emitted from the fuel cell in fluid communication with inlet of the gasifier; and a controller capable of modulating the carbon dioxide entering the gasifier such that the carbon dioxide entering the gasifier represents 1-100 vol.% of all material entering the gasifier;    (3) producing electrical energy comprising: in a gasifier, at least partially gasifying at least a portion of a carbonaceous material in the presence of carbon dioxide so as to give rise to a fuel product comprising carbon monoxide and hydrogen; operating a fuel cell so as to convert at least a portion of the fuel product to at least electrical energy and a second product stream comprising carbon dioxide and water; and recirculating at least a portion of the carbon dioxide evolved from the fuel cell to the gasifier; and    (4) producing a hydrocarbon from a carbonaceous material, comprising: introducing a volume of carbonaceous material into a gasifier; at least partially gasifying at least a portion of that material so as to evolve a first product stream comprising at least carbon monoxide; processing the carbon monoxide of the product stream with hydrogen to give rise to a second product stream comprising at least carbon dioxide and a hydrocarbon; and introducing carbon dioxide into the gasifier such that carbon dioxide constitutes 10-50 vol.% of all material introduced to the gasifier.