Just 0.04% of the atmosphere comprises this odourless, colourless, somewhat poisonous gas. It results from burning carbohydrates, natural gases, and fossil fuels such as wood and coal. From greenhouse growth to wastewater treatment, the gas we produce is used for various purposes, including refrigerant in industrial refrigeration systems, carbonating beverages, fire extinguishing agents, as a solvent in making certain drugs, and freezing and freezing transporting food products.