Upon assuming the G20 presidency last December, South Africa chose “solidarity, equality and sustainability” as its theme. Far from being an empty slogan, this vision reflects the principles on which any credible international response to today’s hunger crisis must rest. Driven by climate change, conflict and inequality, food insecurity is spiking around the world. The tools to address it already exist. The challenge is to mobilize the political will to act. South Africa’s G20 presidency presents a unique opportunity to do just that. Brazil offers a valuable model.