The so-called Paris Agreement was reached at the United Nations Climate Change Conference (COP20) in 2015. This agreement was based on the requirement to keep the increase in the mean global temperature below 2°C relative to the temperature prior to the industrial revolution, and preferably less than 1.5°C. At present, this goal is challenging based solely on the development of carbon-neutral energy systems. The concept of the carbon-neutral society by 2050 seems to be far too late. Herein, we propose an innovative system based on simple chemical reactions using NaOH and CaCl2 via the electrolysis of NaCl or seawater. The generated H2 from the electrolysis of NaCl can be used as a clean energy source for fuel batteries, supplying electricity for the operation of the system. When other renewable energy sources power the system, H2 can be generated as a clean energy alternative. Furthermore, this system produces stable and harmless CaCO3 as a final product, along with NaCl, which can be reused as an electrolysis starting material. The proposed system provides a safe and inexpensive approach for simultaneous CO2 fixation and storage.