Carbon sequestration is a way to capture carbon dioxide and store it in a safe way in order to reduce greenhouse gas emissions. It is a process that involves three steps: capturing CO2 from power plants and factories, compressing and transferring CO2 and injecting it deep underground the earth.
CO2 is captured during combustion before it is released to the atmosphere. Once captured it is transferred through pipelines, trains, trucks or ships and stored underground in fields . Geological formations which are suitable for carbon sequestration include depleted oil and gas fields, coal and saline formations.
After being transferred to these fields CO2 is stored several meters underground in solid but porous rock. Over this rock there are one or more layers of cap rock that insulate properly CO2 and don’t let it escape. These fields are carefully monitored in order to ensure that CO2 stays underground and that there are no leaks to the surface that could cause pollution.
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Photo by geograph.ie / Albert Bridge