To harness, transport and store the CO2

This article about the CO2 sequestration is divided in eight parts. The first part concerns the question of why it is important to harness the carbon dioxide. The second part reviews the different technologies to harness it. In part three, the conditioning and transport of CO2 are studied. Then, the question of geological storage is tackled. The economical aspect of the CO2 sequestration makes the following part. The acceptability of a underground storage is evoked because of the risk relative to the CO2 storage. Some examples and projects (Usa, Canada, France) are presented. The conclusion ends this article with the assurance that the CO2 sequestration is possible, but expansive on the energy level and financing (double investment cost and increasing at least 30% for the production costs for the energy coming from coal). It should be realized on a big scale only if significant tax are imposed to the atmospheric releases in CO2 as it is the case in the Norwegian example (Sleipner field). The storage potentials are important by calling for aquifer layers. The questions of law and acceptability by the public are uncertain but not insurmountable if we think to the aquifers under the seas. (N.C.)