This invention relates to a power recovery process in waste steam/CO2 reformers whereby a waste stream can be made to release energy without having to burn the waste or the syngas. This invention does not make use of fuel cells as its critical component but makes use of highly exothermic chemical reactors using syngas to produce large amounts of heat, such as Fischer-Tropsch. It also relates to control or elimination of the emissions of greenhouse gases in the power recovery process of this invention with the goal of producing energy in the future carbonless world economy. A New Concept for a duplex kiln was developed that has the combined functionality of steam/CO2 reforming, heat transfer, solids removal, filtration, and heat recovery. New methods of carbon-sequestering where the syngas produced by steam/CO2 reforming can be used in Fischer-Tropsch processes that make high-carbon content compounds while recycling the methane and lighter hydrocarbons back to the reformer to further produce syngas at a higher H2/CO ratio.