Visions of planting walls of trees to block the expansion of the desert have long been promoted but never fully realized. The green wall myth persists today even though it is premised on outdated understandings of desertification. We review the history of the idea of green walls and focus on two sets of contemporary initiatives to assess their outcomes: peri-Saharan programs (Algeria's Green Dam and Great Green Wall in sub-Saharan Africa) and China's Three Norths Shelterbelt Program. This review reveals a mixed record of technical success with low rates of tree establishment, particularly in drier areas and monocultures of fast-growing trees vulnerable to disease. While there is evidence for reduced wind erosion in some areas, afforestation is also associated with reduced soil moisture and lowering of water tables. Social impacts include increased water scarcity for people and livestock in some cases, and resource enclosures that particularly work against pastoralist livelihoods. Expected final online publication date for the Annual Review of Environment and Resources, Volume 48 is October 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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The Jewish Farmer Network (JFN) is a North American grassroots organization that mobilizes Jewish agricultural wisdom to build a more just and regenerative food system for all. This paper pre­sents methodological findings and reflections from the initial stages of a participatory action research (PAR) collaboration led by the authors and JFN organizers centered on Cultivating Culture, JFN’s inaugural conference in February 2020. For this early iterative phase, we used a PAR approach to guide event ethnography to both facilitate and understand collective movement building and action. This work included pre-conference collabo­rative research design, a participatory reflection and action workshop with roughly 90 participants, eval­uative surveys, short ethnographic interviews, and ongoing post-conference analysis with researchers and movement organizers. While this data was first analyzed and organized for JFN’s use, we present findings to demonstrate the effectiveness of fore­grounding event ethnography within a PAR re­search design at an early stage of movement for­mation, especially how elements of event ethnogra­phy can address some of the limitations of using PAR with a nascent network of farmers. Our work revealed themes in the movement of Jewish farm­ing: the politics of identity in movement building, the tensions around (de)politicization, and the production of Jewish agroecological knowledge. We reflect on the utility of using PAR to frame scholar-activism and propose future inquires for Jewish agrarianism.