The climate impact of our food consumption is a key issue to sustainability. Yet understanding the food system and the impact it has can be difficult given its abstract nature. In this paper, we report on a Research through Design project aimed at designing and evaluating a data physicalization for supporting collective sense-making of the climate impact of food. Throughout the design process, we have explored the materiality of CO2 emissions and ways to design with less resource use. The resulting data physicalization, Carbon Scales, was evaluated in a three-week field study with 27 participants. Our findings show that collective sense-making can be enabled through interactive data physicalizations and that this can lead to carbon literacy. We expand on a) sustainability through design by arguing for the value of artifacts that let people stay in the interaction as this can support collective sense-making and b) sustainability in design by showcasing the value of designing with an interaction-first and materials-second mindset. CCS CONCEPTS• Human-centered computing → Empirical studies in HCI.

Data have played an extensive role in sustainable HCI research by informing the impacts of our behavior on the environment and helping us make better environmental choices. However, in the area of sustainable food consumption and sustainable HCI, there is little investigation on the roles of food data for the design of technology. This paper presents findings from a qualitative study of sustainable-conscious individuals' food data seeking experiences. Our results show the way in which the current food data is challenging our understanding of its environmental impacts, which concern data of availability, data representations, and data cultures.Drawing from Loukissas' six critical data principles, we discuss how "locality" and "place" could cast a new insight on food and its sustainability. We also offer possible design directions for sustainable HCI technologies utilizing food data.CCS Concepts: • Human-centered computing → Empirical studies in HCI.

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Waste management in urban areas is a complex process, encompassing a variety of activities (e.g., acquiring, sorting, disposing), actors (e.g., single individuals, waste collectors, condominium associations), and capacities (e.g., from household recycling stations to physical infrastructures such as recycling and sorting facilities). Whereas previous HCI design research has tackled problems with waste management from an individual, behavioral change perspective, we approach this design space through a feminist ecological design perspective of Digital Environmental Stewardship. Through a combination of qualitative empirical data and materials generated at design workshops, we outline challenges related to waste management in a complex of five multi-apartment buildings. We propose a number of design explorations addressing such challenges, and reflect on the generative role of the DES framework in framing design from a collective and ecological perspective. CCS CONCEPTS• Human-centered computing → Empirical studies in HCI.

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