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      This paper considers the limits and potential of ‘urban metabolism’ to conceptualize city processes. Three ‘ecologies’ of urban metabolism have emerged. Each privileges a particular dimension of urban space, shaped by epistemology, politics, and model-making. Marxist ecologies theorize it as hybridized socio-natures that (re)produce uneven outcomes; industrial ecology, as stocks and flows of materials and energy; and urban ecology, as complex socio-ecological systems. We map these scholarly islands through bibliometric analysis and literature review (1965-2012), unveiling how the metaphor has become stagnant. To reinvigorate this research we propose the development of political–industrial ecology, using urban metabolism as a boundary metaphor.Tags:                agriculture_urbaine                      urbanite_radar            