Carbon geo-sequestration relates to the process of injecting captured carbon dioxide in deep porous geologic formations for long-term storage. Once CO2 is captured (either from a large point source emitter or through direct air capture), it is compressed to elevated pressures and converted into a supercritical fluid, a state where CO2 is above its critical temperature (304.13 K) and critical pressure (72.8 atm). In this phase, CO2 is then transported mostly by pipelines to the injection site.