H-2 production from organic wastes and metal wastes by absorbing CO2 during pyrolysis and gasification (HyPr-RING method) was studied experimentally. Experiments were performed by using an autoclave at 973 K and 25 MPa. From organic wastes, such as wood, salad oil, styrene foam, PET bottles, black rubber, benzene, graphite, sewage sludge and polyvinyl chloride, it was found that H-2 was the major product gas, while the remainder was CH4. CO2 was completely absorbed by the sorbent of Ca(OH)(2). CO was not detected in the product gas. These wastes had high conversion to gas phase, except styrene form, benzene and graphite. Only 40 ppm NH3 was detected in the product gas of the sewage sludge. Others harmful gases, such as NOx, HCN, H2S and HCl were not detected in the product gases of sewage sludge and polyvinyl chloride. Powders of Al and Fe could be completely converted to H-2 by reaction with H2O. However, with increasing sample size, the conversion of Fe fell rapidly. H-2 production from mixtures of organic and metal wastes was also confirmed by experiment.