Carbon sequestration in agricultural soils is emerging as a promising way to combat climate change by contributing to the removal of carbon dioxide from the earth's atmosphere. To this end, it can be considered as one of the negative emission technologies. The transition to the concrete implementation of this sequestration, and more particularly its legal implementation, makes it possible to measure the challenges to be met in order for carbon to be stored sustainably and effectively in agricultural soils and thus to truly claim to be a negative emission technology. Firstly, this requires strengthening the legal protection of soils, and in this case of agricultural soils in their quantitative and qualitative dimensions in order to preserve their capacity to sequester carbon. Secondly, this requires securing the carbon sequestration technique itself and therefore the legal framework of beneficial agricultural practices.