Alternative food systems and networks, which have emerged around the world, are often fragmentary, reduced in size and frequently unfold in parallel, hardly linked to each other. Agroecology faces the challenge of scaling up these initiatives to gain size and a significant impact on food production and consumption. Within the agroecological movement, however, diverse conceptions exist of what a sustainable food system should be. It is thus necessary to reach an extensive consensus, from the perspective of agroecology, on the principles guiding the construction of such a system. This paper discusses the principles that would best steer the building of Agroecology-based Local Agri-food Systems (ALAS). To this end, a critical review of the scientific literature on alternative food networks and systems was performed. In so doing, we highlighted the aspects that one could consider as purely agroecological in nature and sought to bring them together to form a coherent proposal. Consequently, the present paper systematizes the main contributions of literature on alternative food networks and systems, taking into account the characteristics of sustainability from an agroecology viewpoint, and identifies the issues requiring further development. Several principles are proposed to define local food systems, based on the four dimensions of sustainability: environmental health, economic viability, social equity and the right to decide what, how and for whom food is produced.

The serious problems of agrarian unsustainability cannot be solved through technological changes that lessen environmental impacts. Although technological change is important, it is also necessary to change the agri-food system as a whole. Participatory action research (PAR) is a methodological approach to collaborate with local communities. It enables us to advance in the restructuring of physical flows, economies, and information that support local farming, as a means to achieve greater autonomy and self-management. This article presents several case studies in Spain in which PAR has been applied to build local organic food networks. These are characterized by a more sustainable use of local resources and the development of short food supply chains.

In recent years, the transition to sustainability at a food systems’ scale has drawn major attention both from the scientific and political arenas. Agroecology has become central to such discussions, while impressive efforts have been made to conceptualize the agroecology scaling process. It has thus become necessary to apply the concept of agroecology transitions to the scale of food systems and in different “real-world” contexts. Scaling local agroecology experiences of production, distribution, and consumption, which are often disconnected and/or disorganized, also reveals emergent research gaps. A critical review was performed in order to establish a transdisciplinary dialogue between both political agroecology and the literature on sustainable food systems. The objective was to build insights into how to advance towards Agroecology-based Local Agri-food Systems (ALAS). Our review unveils emergent questions such as: how to overcome the metabolic rift related to segregated activities along the food chain, how to feed cities sustainably, and how they should relate to the surrounding territories, which social subjects should drive such transitions, and which governance arrangements would be needed. The paper argues in favor of the re-construction of food metabolisms, territorial flows, plural subjects and (bottom-up) governance assemblages, placing life at the center of the food system and going beyond the rural–urban divide.

Traditional agroecological knowledge (TAeK) refers to the cumulative and evolving body of knowledge, practices, beliefs, institutions, and worldviews about the relationships between a society or cultural group and their agroecosystems. These knowledge systems contribute to maintaining environmental and culturally sensitive food systems and have been considered very relevant for agroecological transitions, or the processes of scaling-up and -out agroecology. However, TAeK’s erosion and enclosure threatens its use and reproduction, which in turn might affect TAeK’s potential contribution to agroecological transitions. Here, we explore how transforming TAeK, and particularly TAeK on landraces, into a digital commons can contribute to its maintenance and protection, and thus to agroecological transitions. We do so by analyzing the CONECT-e platform, an initiative for digitally storing and sharing TAeK in a participatory way. One year after being launched, CONECT-e has documented 452 geographically distinct landraces from 81 different species. The information shared in this platform is well-structured, clear, and reliable; it thus allows for the replication of the knowledge reported. Moreover, because CONECT-e makes the documented information freely available and protects it with a copyleft license, placing information in this platform could help one face landrace misappropriation issues. CONECT-e, or similar initiatives, could contribute to agroecological transitions via maintaining TAeK under the digital commons framework, making it accessible to all society and avoiding enclosure processes.

One of the factors threatening the sustainability of rural territories is the hegemonic agro-industrial model, whose environmental and social impacts strongly limit rural life. Here, we want to call attention to the opportunities provided by alternative agri-food systems, based on agroecology and food sovereignty, as a cultural heritage to support sustainable local development. We have carried out exploratory research to draft the main agroecological initiatives in Spain, particularly those having explicit support or encouragement from public administrations. An on-line questionnaire (n = 40) was delivered, and in-depth interviews (n = 15) were carried out among a sample of people working in the Spanish agroecology sector (public and private). The results demonstrate how the recovery and promotion of traditional ecological knowledge can help to increase the capacity of the social-ecological systems to cope with shocks and disturbances and maintain long-term resilience. In addition, agroecological practices allow collective identities to emerge around the characteristics of the territory strengthening local life, placing the society-ecosystem coevolution at the center of local identity. In conclusion, although still a minority, we have showed how several types of policies conceiving agroecological practices as an intangible collective heritage, with significant transformative potential towards local sustainability, have already been implemented.