Nigeria is facing a dual, interconnected crisis of rising food insecurity and worsening climate impacts. By 2025, an estimated 33.1 million Nigerians are projected to be food insecure, driven by economic, environmental, and nutritional challenges. The 2024 Global Hunger Index ranked Nigeria 110th out of 127 countries with a serious hunger score of 28.8, while around 35% of children under five are stunted, particularly in northern states. In response, GAIN engaged Sawubon Advisory Services to generate actionable insights on the climate–nutrition nexus, providing evidence to support the integration of climate and nutrition considerations into national and subnational policies, programmes, and investments. The climate crisis is intensifying these challenges, with studies from 2000–2023 showing that rising temperatures, erratic rainfall, and extreme weather have reduced agricultural productivity. By 2080, yields of staple crops such as millet and sorghum in northern Nigeria could decline by 13–20%. With over 80% of agriculture dependent on rainfall, increasing temperatures and water stress are threatening sustainable food production and nutrition outcomes.