Source: https://www.researchgate.net/profile/Pierre-Alain-Jayet/publication/220027901_RACgulation_de_l'effet_de_serre_d'origine_agricole_Puits_de_carbone_et_instruments_de_second_rang/links/55f04c3308aedecb68ff9b8b/RACgulation-de-leffet-de-serre-dorigine-agricole-Puits-de-carbone-et-instruments-de-second-rang.pdf