![]() ![]() It is a trace gas in Earth's atmosphere at 421 parts per million (ppm), or about 0.04% (as of May 2022) having risen from pre-industrial levels of 280 ppm or about 0.025%. When carbon dioxide dissolves in water, it forms carbonate and mainly bicarbonate ( HCO − 3), which causes ocean acidification as atmospheric CO 2 levels increase. Carbon dioxide is soluble in water and is found in groundwater, lakes, ice caps, and seawater. ![]() In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas. It is found in the gas state at room temperature, and as the source of available carbon in the carbon cycle, atmospheric CO 2 is the primary carbon source for life on Earth. It is made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. Carbon dioxide is a chemical compound with the chemical formula CO 2. ![]()
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