This is a paper that arose out of a GRA meeting in Cali Colombia early 2019 driven forward by Prof Pete Smith. Louis Schipper and Stephen McNeill attended with support from GRA and time for contributing to writing paper from NZAGRC

Smith, P.; Soussana, J-F.; Angers, D.; Schipper, L.A.; Chenu, C.; Rasse, D.P.; Batjes, N.H.; van Egmond, F.; McNeill, S.; Kuhnert, M.; Arias-Navaro, C.; Olesen, J.E.; Chirinda, N.; Fornara, D.; Wollenberg, L.; Álvaro-Fuentes, J.; Sanz-Cobena, A.; Klumpp, K. (in press). How to measure, report and verify soil carbon change to realise the potential of soil carbon sequestration for atmospheric greenhouse gas removal. Global Change Biology.