Our global food system is undergoing rapid change. Since the global food crisis of 2007-2008, a range of new issues have come to public attention, such as land grabbing, food prices volatility, agrofuels and climate change. Peasant social movements are trying to respond to these challenges by organizing from the local to the global to demand food sovereignty. As the transnational agrarian movement La Via Campesina celebrates its 20th anniversary,...