The normative aim of environmental justice poses two challenges to the management of agricultural systems: (1) improvement of access for today's rural poor to vital ecosystem services ('intragenerational environmental justice'); and (2) sustenance of critical ecosystem funds to enable future persons access to vital ecosystem services ('intergenerational environmental justice'). The paper investigates whether, and how, these justices have been simultaneously enhanced by the Philippine farmer network MASIPAG. It compares evaluation data on MASIPAG and conventional farming systems within a normative framework based on the justice conceptions by Rawls and Sen, and analyses the impact of certain determinants on both justices.