In order to reduce greenhouse gas emissions and mitigate global warming, creative solutions are essential as the globe struggles with the increasing effects of climate change. Carbon Capture and Sequestration (CCS) is one such approach that has become a key technological tool in the battle against climate change. Around 50 million tonnes of carbon dioxide (CO2) were captured by CCS systems globally in 2024, according to the International Energy Agency (IEA), marking a major advancement toward net-zero emissions. The complexities of CCS are examined in this article, along with its procedures, advantages, difficulties, and function as a vital instrument for a sustainable future.

Understanding Carbon Capture and Sequestration

Carbon capture and sequestration techniques are intended to absorb CO2 emissions from power plants and industrial activities, transport the captured CO2, and safely store it underground to keep it from leaking into the atmosphere. The goal of the process is to reduce CO2, a major greenhouse gas that contributes to global warming. For high-emission sectors that are challenging to totally eliminate, such as steel, cement, and fossil fuel-based power sources, CCS is especially crucial. The three main stages of the CCS process are capture, transport, and storage. To ensure effectiveness and security, each step requires advanced technology and careful preparation. As they switch to renewable energy sources, high-emission companies can drastically lower their carbon footprint via CCS.

Step 1: Carbon Capture

Capturing carbon dioxide at the point of emission and preventing it from entering the atmosphere is known as carbon capture. Usually, this is carried out at sizable power plants or industrial sites. Three main capturing techniques exist:

• Post-Combustion Capture: This method captures CO2 from the flue gases produced after fossil fuels are burned. It’s widely applicable to existing power plants. Recent studies have shown post-combustion capture efficiencies between 80 – 90%, increasing with improvements observed when using a heat-integrated stripper.
• Pre-Combustion Capture: Used mainly in gasification plants, this method converts fuel into a gas mixture before combustion, allowing CO2 to be separated more easily.
• Oxy-Fuel Combustion: This technique burns fuel in an oxygen-rich environment, producing a flue gas primarily composed of CO2 and water vapor, which simplifies CO2 separation.

Capture technologies are energy-intensive, but advancements have improved their efficiency. For instance, the recently developed amine-based solvent shows promising qualities in capturing CO2 with a lower cost of $50.6/tonne CO2 (Zheng, Barpaga et al. 2020) and $47.10/ tonne of CO2(Jiang, Mathias et al. 2021).

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Step 2: CO2 Transport

CO2 needs to be moved to a storage location after it has been caught. Although trucks or ships may be used for lower volumes, pipes are usually employed for this. According to the IEA, there will be more than 8,000 kilometers of CO2 pipes operating worldwide in 2025, making pipelines the most popular and economical option. 5,000 kilometers are in the United States alone, mostly in Texas and along the Gulf Coast.

Careful observation is necessary when transporting CO2 to guarantee safety and stop leaks. To increase transport efficiency, the CO2 is compressed into a supercritical state, which is a dense, liquid-like form. Strict regulations control pipeline construction and operation to lessen environmental and public safety risks.

Step 3: Carbon Sequestration

In the process of sequestration, collected CO2 is injected into subterranean geological formations, usually 1-2 kilometers below the surface. Deep saline aquifers, unmineable coal seams, and depleted oil and gas reserves are all good places to store energy. These formations have porous rock capped by impermeable layers that trap the CO2 permanently.

In 2024, the Sleipner project in Norway, one of the world’s longest-running CCS projects, celebrated 28 years of successful CO2 storage, having sequestered over 23 million tonnes of CO2 in a saline aquifer beneath the North Sea. Monitoring technologies, such as seismic imaging, ensure that stored CO2 remains securely trapped, with leakage risks estimated at less than 0.01% over 1,000 years, according to a 2025 study by the Intergovernmental Panel on Climate Change (IPCC).

Why is Carbon Capture and Sequestration Essential?

A key instrument for accomplishing global climate goals, especially the Paris Agreement’s goal of keeping global warming to 1.5°C, is carbon capture and sequestration. Because they depend on high-temperature procedures or chemical reactions, industries like chemicals, steel, and cement emit a lot of CO2. For instance, 8% of the world’s CO2 emissions come from the manufacture of cement. As other technologies, such as green hydrogen, are expanded, CCS provides a workable way to cut emissions from these industries.

CCS allows fossil fuel-dependent regions to transition to a low-carbon economy without immediate economic disruption. At least 52 new CCS projects – representing nearly 53 million metric tons (MMT) per year of capture capacity – have been announced following the 2022 expansion of the Section 45Q tax credit under the Inflation Reduction Act (IRA). CCS can be paired with bioenergy (BECCS) to produce negative emissions by capturing CO2 from biomass combustion and storing it underground. It is estimated that BECCS could remove 1–10 gigatonnes of CO2 annually by 2050, a crucial step toward net zero.

The Future of Carbon Capture and Sequestration

The landscape of CCS is growing quickly on a worldwide scale. According to the Global CCS Institute, there were 45 commercial CCS facilities operating globally in 2024, and 73 more were under development. Innovations that take CO2 directly out of the environment, such as direct air capture (DAC), are likewise becoming more and more common. For instance, 4,000 tonnes of CO2 are collected annually by the Orca plant in Iceland, which has been in service since 2021.

Technology breakthroughs, more money, and international cooperation are essential for successfully scaling CCS. Global yearly investment in clean energy must more than triple to almost $4 trillion by 2030 in order to achieve net-zero emissions by 2050. By the end of the decade, everyone will have access to clean cooking and power, millions of new employment will be created, and global economic growth will be greatly boosted. In order to meet this goal, public-private partnerships and carbon pricing schemes will be essential.

Conclusion

A key component of international efforts to tackle climate change is carbon capture and sequestration. CCS addresses emissions from hard-to-abate sectors, promotes a just transition, and permits negative emissions by absorbing and storing CO2 from industrial sources. Even though issues like excessive expenses and energy requirements still exist, advancement is being fueled by continuous advancements and legislative assistance. With a growing pipeline of projects and 50 million tonnes of CO2 captured in 2025, CCS is demonstrating its value as a crucial component of a sustainable future. One captured molecule at a time, the world may get closer to a low-carbon future with this essential technology.

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