This document outlines an action plan for transitioning the global food system to 100% agroecology. It summarizes key findings from the International Assessment of Agricultural Knowledge, Science and Technology for Development (IAASTD) report that business as usual is not sustainable and a fundamental shift is needed. The plan calls for interventions at multiple levels including policies, institutions, and research to support agroecological practices that are sustainable, equitable and address multifunctionality through a systemic approach. Modeling shows that modest global investments of 0.1-0.16% of GDP annually could help transition food production to nourish the world population through 2050 in an environmentally and socially sustainable way.