Carbon capture and storage (CCS) technologies capture fossil fuel emissions for permanent disposal underground, as part of the larger effort known as carbon capture, utilization, and storage (CCUS).
CO2 can be utilized in several ways, though only some offer net climate benefits after taking into account all indirect and other effects.
Capture
Carbon Capture and Storage (CCS) technology enables carbon-intensive industries to continue operations while significantly reducing emissions. CCS systems extract CO2 from flue gas at its source before transporting it underground for long-term storage.
Captured CO2 is compressed into liquid form for transport and stored at sites with suitable geology – for instance depleted oil and gas reservoirs, coalbeds or saline aquifers. Carbon Capture Storage (CCS) technology could help lower atmospheric CO2 levels and curb climate change, especially where emissions cannot be completely reduced or eliminated entirely.
Although CCUS is often presented as a solution to climate change, it should be remembered that its application only covers upstream impacts associated with fossil fuels such as mining, transportation and methane emissions from them. Furthermore, CCS use is mostly restricted to enhanced oil recovery (EOR), which does not result in net climate benefits when indirect effects are considered.
Compression
Carbon dioxide collected from coal- and natural gas-fired power plants and industrial facilities can be compressed into liquid form for transportation and storage, but this requires significant amounts of energy.
CCS is an essential technology to reduce global CO2 emissions and mitigate climate impacts that have already had devastating consequences on communities around the globe. It helps combat legacy pollution in our atmosphere while attenuating future impacts to keep climate impacts to an acceptable level.
Post-combustion capture involves extracting CO2 from coal or gas plant’s flue gas streams before transporting it underground for permanent storage. This process may use various technologies, including oxy-fuel combustion (in which fossil fuel is burned with pure oxygen) and pre-combustion carbon capture.
Associating carbon dioxide removal (CDR) and carbon capture and storage (CCS) interchangeably is highly misleading, given their disparate impacts on our climate. CDR can lower atmospheric concentrations of CO2, while CCS attempts to prevent future emissions by blocking its entry.
Transportation
CCS involves using carbon capture technology to lower emissions from transportation sources. For instance, buses powered by natural gas could be equipped with carbon capture devices to make them zero emissions vehicles; and researchers are developing technologies designed to lessen aviation’s environmental impact.
Once CO2 has been captured, it can be transported via pipeline, ship, or rail to its final storage site. Preferably, deep geological formations such as saline aquifers and depleted oil and gas reservoirs would provide optimal storage solutions.
Storing CO2 underground helps prevent it from entering the atmosphere where it contributes to global warming, while at the same time making room for its reuse in industrial processes or as biofuels and power production – known as carbon capture, usage, and storage (CCUS). Leading organizations including Intergovernmental Panel on Climate Change and Bloomberg New Energy Finance have both laid out long-term energy outlooks reliant on rapid expansion of CCUS technologies.
Storage
Carbon capture and storage (CCS) is an unwise strategy employed by fossil fuel and biomass polluters that diverts resources away from renewable energy transition efforts. CCS works by diverting CO2 released by power plants through pipelines to be stored underground as waste material.
CCS does not produce net climate benefits when combined with renewable and efficient energy resources, and may incur significant health, environment and social costs due to land clearing for infrastructure purposes and associated forest cutting/cutting/deforestation costs.
Climeworks specializes in structural trapping, in which CO2 is injected into porous rock formations inaccessible to human access and isolated from surrounding rocks by an impermeable seal rock layer. Another alternative involves CO2 being stored deep underground within large-volume saline formations; this method has been widely tested.