Fil: Garibaldi, Lucas Alejandro. Universidad Nacional de Río Negro. Instituto de Investigaciones en Recursos Naturales, Agroecología y Desarrollo Rural; Argentina.Fil: Garibaldi, Lucas Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Recursos Naturales, Agroecología y Desarrollo Rural; Argentina.Fil: Azzu, Nadine. Food and Agriculture Organization of the United Nation; Italia.Ecosystem services provide essential monetary and non-monetary benefits to humans. However, the value of these benefits (particularly those external to agriculture), measured in monetary terms, is not always included in agricultural and national accounting. Many ecosystem services are not traded in markets and do not have imputed monetary value, although good estimates of monetary value can be obtained for some of them by calculating the costs of replacing the service (for example, the costs of treating polluted water using artificial means). This is an issue for the conservation of the natural assets that provide ecosystem services because when natural assets do not have an assigned monetary value, the market indicates that it is more profitable to convert land to other uses (Pretty and Smith, 2004).