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Sustainability initiatives, such as Repair Cafes, are sites of niche innovations with the potential to contribute to an urban sustainability transition. Using the multi-level perspective as a framework, we explore the visions of change of 12 Repair Cafes in Berlin to understand how the members believe the movement can effect change. We explore the dynamics and demographics of the different user groups within the Repair Cafes to understand who has a voice within them. We found that Repair Cafes have two main visions of change which ask for mass participation. However, we also found that latent discrimination by 'expert' technician volunteers discourages the involvement of women and lower social classes. This knowledge that Repair Cafes are inconsistent in their purported visions of change and their practices has repercussions for their role in urban sustainability transitions. Highlights: • Repair Cafes envision a transition where as many people as possible participate in repair activities. • The roles and hierarchy within the Repair Cafes lead to power differentials. • The roles within Repair Cafes lead to women and lower classes being discouraged from participation. • Repair Cafes are inconsistent between their visions of change and their practices. • Current Repair Café practices hurt their ability to contribute to a transition. [ABSTRACT FROM AUTHOR]

Agriculture is a major sector responsible for greenhouse gas emissions. Local food production can contribute to reducing transport-related emissions. Since most of the worldwide population lives in cities, locally producing food implies practicing agriculture in urban and peri-urban areas. Exemplary, we analyze the potential to produce fresh vegetables within Berlin, Germany. We investigate the spatial extent of five different urban spaces for soil-based agriculture or gardening, i.e., non-built residential areas, allotment gardens, rooftops, supermarket parking lots, and cemeteries. We also quantify inputs required for such food production in terms of water, human resources, and investment. Our findings highlight that up to 82% of Berlin's vegetable demand could be produced within the city, based on a reasonable validation of existing areas. Meeting this potential requires 42 km 2 of urban spaces for cultivation, a considerable amount of irrigation water, around 17 thousand gardeners, and over 750 million EUR of initial investments. The final vegetable cost would be around 2 EUR to 10 EUR per kg without any profit margin. We conclude that it is realistic to produce a significant amount of Berlin's vegetable demand within the city, even if it comes with great challenges. • There is enough space in Berlin for gardening/agriculture. • The potential amount of vegetables represents a significant share of the annual consumption. • Such local gardening can have many advantages in terms of sustainability. • Another advantage are reduced carbon emissions from food transport. [ABSTRACT FROM AUTHOR]