Drawing from fieldwork of 13 small food farms in the Midwestern U.S., we describe the on-the-ground, practical challenges of doing and communicating sustainability when local food production is not well-supported. We illustrate how farmers enact learned and honed tactics of sustainability at key sites such as farmers' markets and the Internet with consumers. These tactics reveal tensions with dominant discourse from government, Big Ag, and popular culture. The success of these tactics depends on farmers having fortitude-control, resilience, and the wherewithal to be exemplars of sustainability. In our discussion, we highlight how the local farmers' social movement work constitutes loosely organized small groups connecting others to an amorphous idea of a sustainable society-one that sustains an environmental, economic, local, cultural, and physical way of life. Using Fine's concept of tiny publics, we identify design opportunities for supporting this less directed kind of social movement.CCS Concepts: • Human-centered computing → Human computer interaction (HCI); Computer supported cooperative work;

Recent years have seen increased investment in data-driven farming through the use of sensors (hardware), algorithms (software), and networking technologies to guide decision making. By analyzing the discourse of 34 startup company websites, we identify four future visions promoted by datadriven farming startups: the vigilant farmer who controls all aspects of her farm through data; the efficient farmer who has optimized his farm operations to be profitable and sustainable; the enlightened farmer who achieves harmony with nature via data-driven insights; and the empowered farmer who asserts ownership of her farm's data, and uses it to benefit herself and her fellow farmers. We describe each of these visions and how startups propose to achieve them. We then consider some consequences of these visions; in particular, how they might affect power relations between the farmer and other stakeholders in agriculture-farm workers, nonhumans, and the technology providers themselves.

Past CSCW work has examined the role of temporal rhythms in cooperative work and has identified alignment work--the work required to bring dissonant rhythms into alignment--as an important aspect of large-scale collaboration. We ask instead how individual workers interact with temporal rhythms to sustain the conditions that make their work possible--not aligning rhythms, but attuning them. This paper draws on interviews with farmer-knowledge workers, people who engage with both farm work (the work of growing food or raising animals for food, on a commercial or non-commercial basis) and computer-based knowledge work. We identify three ways that farmer-knowledge workers interact with natural and structural rhythms to construct sustainable work-lives: anchoring (tying oneself to a particular rhythm to create accountability and structure), decoupling (loosening or cutting ties with a rhythm to create flexibility), and gap-filling (interweaving complementary rhythms to create balance). Together, these practices constitute attunement work.

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