This issue of Public Health Nutrition includes a variety of articles relating to environment and sustainability. Last month, in an editorial for this journal, Barrie Margetts posed these questions, among others, in preparation for the World Nutrition Rio2012 Congress in April: 'Can we feed the world in an environmentally sustainable way?' and 'Can we assume that the current dominant model of global food production is environmentally sustainable?' (1). In this issue, O'Kane (2) asks a related question: 'What is the real cost of our food?' The real cost, in terms of social, environmental and health costs, is of course high, and O'Kane makes a strong case for supporting local food systems in order to encourage more sustainable food production methods, development of local economies and stronger ties between farmers and consumers. Her article goes further to challenge public health nutritionists to explore the potential of local food systems for reducing inequities, improving access and promoting health, to encourage people to become 'food citizens' and to advocate for sustainable food systems. School gardens are one facet of a local food system, but without financial support success in school gardening programmes is difficult to achieve. The California Instructional School Garden Program, authorizing the distribution of $US 15 million worth of grants towards school gardens, is one such well-intentioned effort. But as Hazzard et al. (3) show, in less than half of the schools receiving grants were the funds sufficient to accomplish their garden goals; over a third of schools responded that the severe budget deficit in California had a negative impact on their garden programme. School garden programmes might enjoy greater success if they are integrated into existing curricula, with active involvement by (often undervalued) home economics teachers as well as school food service personnel. If not integrated into the school curriculum, such garden programmes will continue to be viewed as external to schools' objectives and needs, and as competition for limited funding. Clearly, for local food systems to survive, they must have ongoing support and commitment from all corners: government, educators, 'food citizens' and public health practitioners. We often think of sustainable food systems and good health as going hand in hand. Clonan et al. (4) directly address one instance in which they are at odds-the recommendation of eating fish as an alternative to red meats-and the risk of depleting already overburdened fish stocks. They find that, in the UK, health is the primary motivation for people to eat fish, and only one out of four people think about whether the fish they buy comes from