Book excerpt: Global agricultural trade has increased significantly in value terms since 2000. Its pattern has also changed – emerging economies and developing countries play a bigger role in international markets, and South–South agricultural trade has expanded significantly. Climate change is expected to affect agriculture, food security and nutrition unevenly across countries and regions. Changes in comparative advantage in agriculture around the world will also affect international trade. This edition of The State of Agricultural Commodity Markets focuses on the complex and underexplored intersection between agricultural trade, climate change and food security. The report makes an important contribution to the policy debates on climate change adaptation and mitigation under the Paris Agreement and the multilateral agricultural trade rules. The report discusses policies – both domestic support and trade measures – that can promote food security, adaptation and mitigation, and improve the livelihoods of family farmers around the world. Given both the slow- and rapid-onset impacts of climate change, policies that can significantly promote climate change adaptation and mitigation would benefit from deeper discussions in international fora on how to strengthen the mutually supportive role of trade rules and climate interventions.