Human milk is a renewable, adaptive, and personalized source of nutrition—yet it is rarely discussed in conversations about food systems, climate resilience, or planetary health. We are developing an ambitious interdisciplinary project to position lactation as a keystone of sustainable food systems. Despite the environmental and food security implications of infant feeding, most countries have not integrated breastfeeding into their climate resilience planning, and the global environmental footprint of the commercial milk formula industry has never been comprehensively described. Through this initiative, we aim to advance a more rigorous global research agenda on human milk, protect parents from misinformation in the age of AI, and reimagine workplaces and communities so that breastfeeding becomes a sustainable, accessible choice for all families—especially those most vulnerable to supply chain disruptions and climate-related food insecurity. This work will generate research publications, policy recommendations, and public engagement opportunities.