The Greensand project has begun injecting carbon dioxide into underground geological reservoirs in the North Sea, at a depth of 1800 meters. This initiative, supported by Ineos, Harbour Energy, the Danish government, and the European Union, marks the first carbon capture and storage (CCS) project in the European Union. CCS is a method used to reduce greenhouse gas emissions by capturing carbon dioxide from industrial processes and storing it underground, preventing it from entering the atmosphere. The Greensand reservoir is located 250 kilometers from the Danish coast and is situated at the level of the former Nini West oil platform. It will initially accommodate 400,000 tons of liquid CO2 per year, with the goal of reaching a rate of 4 to 8 million tons of CO2 per year by 2030. In addition to the Greensand project, a pipeline under construction in western France is intended to transport CO2 emitted by cement producers such as Lafarge or Lhoist to the Montoir-de-Bretagne terminal, where it will be transported by sea to Norway. Norway hosts the first European CO2 storage site, Northern Lights, which was inaugurated two years ago and uses an old marine aquifer reservoir that previously sequestered salt water. An aquifer is a layer of water-bearing rock that can store large volumes of fluids, making it suitable for CO2 storage. The initiative is part of a broader effort to reduce carbon emissions across Europe by utilizing existing infrastructure and geological formations for long-term CO2 storage. These projects are designed to support the transition to a low-carbon economy by providing a way to manage emissions from industries that are difficult to decarbonize directly. The success of these early projects could pave the way for more storage sites across Europe, potentially including locations in France if the 2024 call for expressions on the subject bears fruit. The development of these CCS projects reflects a growing commitment to addressing climate change through technological innovation and international collaboration. By leveraging existing oil and gas infrastructure, these projects aim to reduce the cost and complexity of implementing carbon capture and storage on a larger scale. As the technology matures and more storage sites become available, the potential for significant reductions in carbon emissions across Europe continues to grow.