In an era of global warming, food is the canary in the mine. Food prices are rising, droughts and storms are affecting farmers and the global model of food production is under challenge. The source, supply and price of food is likely to change significantly. Policies to reduce the impact of climate change will have a profound impact on food supply around the world. Food Chain explores the dimension of this looming problem, and our complex relationship with food. In the lead essay, Margaret Simons explores the complexity of the Murray Darling river crisis and its impact on the security of Australia's food bowl. This essay will provide a new framework to thinking about sustainable food production and contemporary policy debates on food security. The issue will range widely across the whole food chain from farm gate to supermarket shelves with a national and global perspective. It features many of the best food writers and thinkers on sustainability, agriculture and the social and cultural importance of food, with fresh, challenging and engaging perspectives.