NOVELTY - The method comprises chemically converting biomass using water vapor or thermal energy into carbon dioxide and hydrogen, separating both gases, sequestering carbon dioxide, and using hydrogen for power generation. The decay products of the biomass are used. The biomass is organic waste materials. The fossil carbon or fossil carbon compounds is added to the biomass. The hydrogen from the biomass is introduced into natural gas. The method further comprises introducing hydrogen into a natural gas containing reservoir, where the natural gas is displaced.    USE - The method is useful for ecologically sequestering carbon dioxide.    ADVANTAGE - The method allows economic ecological sequestration of carbon dioxide using fossil fuel high-energy and without using additional power plants in an environmentally-friendly manner.    DETAILED DESCRIPTION - The method comprises chemically converting biomass using water vapor or thermal energy into carbon dioxide and hydrogen, separating both gases, sequestering carbon dioxide, and using hydrogen for power generation. The decay products of the biomass are used. The biomass is organic waste materials. The fossil carbon or fossil carbon compounds is added to the biomass. The hydrogen from the biomass is introduced into natural gas. The method further comprises introducing hydrogen into a natural gas containing reservoir, where the natural gas is displaced, introducing the carbon dioxide into a reservoir loaded with hydrogen, where hydrogen is displaced. During the displacement of the natural gas with hydrogen, the hydrogen is introduced into an upper area of the reservoir and the natural gas is taken in a bottom portion of the reservoir. During the displacement of hydrogen with carbon dioxide, carbon dioxide is introduced into the bottom portion of the reservoir and hydrogen is taken in the upper area of the reservoir. Hydrogen is separated from gas mixtures arising during the process. The promoted natural gas, natural gas/hydrogen mixture or promoted hydrogen is used for power generation or for heating applications.