This is a postprint version of the following published document: Zorrilla-Muñoz, V., Petz, M., & Agulló-Tomás, M. S. (2020). GARCH model to estimate the impact of agricultural greenhouse gas emissions per sociodemographic factors and CAP in Spain. Environment, Development and Sustainability, 23 (3), pp. 4675-4697. DOI: 10.1007/s10668-020-00794-y © 2020, Springer Nature B.V