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Carbon dioxide concentrations have risen to dangerous levels due to human activity. The gas acts as a blanket, trapping solar energy and causing global warming. CCS can prevent excess CO2 from entering the atmosphere.
But at about 422 parts per million, or 0.04%, its concentrations are some 50% higher than 200 years ago, at the start of the Industrial Revolution.
CCS involves capturing carbon dioxide from point sources like power plants and storing it underground. The process is controversial due to safety concerns but can be an effective method to reduce CO2 emissions.
Carbon capture and storage, or sequestration (CCS), can prevent excess carbon dioxide from getting into the atmosphere in the first place.