Acute and chronic exposure on humans of carbon dioxide contained both in the air of enclosed spaces and in the atmosphere of the Earth are described. The current tendencies of increasing the CO2 content in the external and internal aerial environment of buildings are shown. A forecast of the consequences of an increase in the content of carbon dioxide in the atmosphere for human health is presented. The paper presents information on the technological systems created by the “Carbon Engineering” enterprise for cleaning the atmosphere from CO2, allowing to eliminate the accumulation of carbon dioxide in the air, regardless of the reasons causing the accumulation. The use of technologies of physicochemical and bio regeneration of the chemical composition of air and water is proposed to create an artificial environment favorable for humans.