In 2008, there were approximately 5,800 km of CO2 pipelines in the United States, used to transport CO2 to oil production fields where it is then injected into older fields to extract oil.
在2008年，美國大約有5,800公里的二氧化碳管道用作輸送二氧化碳至油田，以注入老油田開採石油。