Former C21 fellows Ryan Hollifield (2010-11) and Mick Day (2010-11) propose a conceptual framework for analyzing the phenomenon of the “sacrifice zone” within the emerging research paradigm of critical physical geography, using the illustrative case of frac sand mining in western Wisconsin. Read “A framework for a critical physical geography of ‘sacrifice zones’: Physical landscapes and discursive spaces of frac sand mining in western Wisconsin,” in the October 2017 issue of Geoforum.