The growing realization that global CO₂ emission targets for 2030 and 2050 are increasingly unlikely to be met has prompted a debate on prioritizing climate change adaptation over mitigation. However, the Intergovernmental Panel on Climate Change (IPCC) emphasizes the critical role of mitigation, particularly through carbon capture, absorption, and storage, as a vital strategy to curb atmospheric CO₂ concentrations.
The history of carbon capture and storage (CCS) began with unintentional applications, such as using CO₂ for enhanced oil recovery in 1972. The first large-scale dedicated project emerged in 1996 at Norway’s Sleipner gas field, where CO₂ extracted from natural gas was stored beneath the seabed. While the Kyoto Protocol recognized CCS as a potential mitigation tool, its implementation has faced challenges, including high costs and concerns about perpetuating fossil fuel dependence.
Despite these criticisms, carbon capture remains essential for industries with limited decarbonization options, such as cement production. Beyond traditional CCS, the concept of carbon dioxide removal (CDR) has gained prominence, aiming for “negative emissions.” CDR technologies, including BECCS (bioenergy with carbon capture and storage) and DACCS (direct air capture and carbon capture and storage), seek to actively remove CO₂ from the atmosphere. BECCS captures carbon from biomass combustion, while DACCS directly extracts CO₂ from ambient air. While these technologies hold promise, they are still in early stages of development and contribute only a small fraction of the necessary emission reductions.
Nature-based CDR solutions offer another avenue for carbon capture. Reforestation, wetland and peatland restoration, and soil carbon sequestration provide natural mechanisms for removing CO₂. However, these methods are subject to uncertainties, including the impacts of climate change, potential methane emissions, and the stability of carbon storage. Even seemingly straightforward actions, such as soil preparation for tree planting, can release stored carbon.
Other innovative CDR approaches are being explored, including biochar production, the use of CO₂-consuming microorganisms, enhanced weathering of rocks, and the development of artificial soils. Initiatives like the C-SINK project are investigating these diverse carbon capture and removal methods, demonstrating the breadth of potential solutions.
The transition to a low-carbon economy is a complex and challenging undertaking. Energy transitions are inherently slow and incremental. The uncertainties surrounding the effectiveness and scalability of carbon capture technologies should not deter their development. While immediate emission reductions are paramount, capturing and storing existing CO₂ is equally crucial. A comprehensive strategy, combining aggressive emission reduction with robust carbon capture and removal efforts, is essential to mitigate the adverse effects of climate change. The necessity of deploying every tool at our disposal has never been more evident, and carbon capture technologies are a key component of that arsenal.