From Francis Alys and Ursula Biemann to Vivan Sundaram, Allora & Calzadilla, and the Center for Urban Pedagogy, some of the most compelling artists today are engaging with the politics of land use, including the growth of the global economy, climate change, sustainability, Occupy movements, and the privatization of public space. Their work pivots around a set of evolving questions: In what ways is land, formed over the course of geological time, also contemporary and formed by the conditions of the present? How might art contribute to the expansion of spatial and environmental justice?...