Inorder to achieve the idea of going carbon negative, Coking has by far been the biggest practical hurdle. This was very effeciently overcome by a group of chemists who made use of a liquid catalyst ,a Gallium alloy Galistan, in the presence of Cerium Nanoparticles. Thus they have been successful in converting Carbon dioxide,the major green house gas,to a solid carbonaceous material. For more information : Doi : 10.1038/s41467-019-08824-8