First, today, we know how to sequester gases in deep geological layers. At Air Liquide, we have been doing it with natural gas for a number of decades. We also do it with hydrogen. We currently have networks of hydrogen in the United States, in the Gulf of Mexico, where they have what they call caverns, in which hydrogen is stored. It is easy to imagine storing carbon dioxide in the same way, as it is a relatively stable molecule. That's the first point.
As for how effective the capture and sequestration processes themselves are, the technology has been in existence now for a number of years and it is reliable. We demonstrated that in 2018 at Port‑Jérôme in France. We have one unit of that kind in operation.
We have also been injecting carbon dioxide into geological layers for many years.