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NEEDED: GEOGRAPHIC RESEARCH ON URBAN SUSTAINABILITY

According to United Nations projections, six billion of the world's nine billion people in the year 2050 will live in cities, a tripling of the urban population over current levels in just two generations. Urbanization at this unprecedented scale poses simultaneous challenges of social and economic destitution and massive environmental degradation. These twin perils, in turn, have prompted calls from myriad quarters for research and action promoting urban sustainability. Geographers, however, and urban and economic geographers in particular, appear loathe to take up the challenge. This reticence may be explained, in part, by the fact that sustainability is a chaotic concept plagued by multiple definitions corresponding more often to political interests than to substantive considerations. It is further explained as the legacy of sub-disciplinary compartmentalization, such that geographers working in any of the multiple specializations encompassed by sustainability—scholars of first-world cities, of third-world urbanization, of environmental or ecological processes, or political ecology—rarely encounter one another and even less frequently find opportunities for the synthetic, cross-disciplinary analysis implicated in an understanding of urban sustainability. But accelerating urbanization and its potentially cataclysmic consequences continue apace, neither deflected nor deterred by our disciplinary paralysis. The replication and expansion of unsustainable forms and practices of production, consumption, and reproduction continue even as geographers allow external debates to define and curtail our disciplinary agendas. Yet geography, with its shared traditions of society-space and