The biggest challenges facing the food system are climate breakdown and environmental degradation. The food system is a cause and a necessary part of the solution to both. This Policy Brief summarises the food-relevant findings of a key report from the International Panel on Climate Change. It spells out the significant, ‘gigaton-scale’ impact food-related decisions, from individual to policy level, could have in adapting to climate change and averting its worst future impacts. It shows why none of us working in the food system, in academe, civil society or governance, can view climate change as ‘someone else’s problem’.