Materiality and waste: inorganic vitality in a networked world { At a first level, the papers in this theme issue provide a contribution to the diversity and vitality of current waste scholarship. At another level they are a means to moving waste scholarship to a fuller engagement with materiality. Our starting point here is a paradox. Waste is intrinsically, profoundly, a matter of materiality and yet önotwithstanding a sustained engagement with materiality in certain areas of the social sciences of lateömuch of what is most readily identified as waste research remains staunchly immaterial. Just as much as societies have sought to distance themselves from and hide their wastes for fear of contamination, so academia has been shy of the stuff of waste. Predominantly, social science work identifies waste in terms of waste management; a move which ensures that waste is defined by, and discussed in terms of,`disposal' technologies, orömore correctlyöwaste treatments, and their connection to policy. The stuff of waste therefore is translated into treatment technologiesöprincipally the established ones of incineration and landfill but also emergent technologies such as anaerobic digestion. Or, it is reconfigured as resource recovery, that is, as recycling, reuse and remanufacturing. Thence, for the most part, it is translated into metricsö tonnes and targets. To modify Zygmunt Bauman's paraphrasing of Karl Marx, with waste all that is solid (or indeed liquid) tends to melt, if not into air, into the register of the categorical. Further, the radical separation of waste as material and matter from a policy world of tonnes and targets inscribes itself into clear academic divisions of labour. Hence, waste in the social sciences has hitherto been the primary concern of environmental policy and urban planning, whilst stuff and its treatment remain the preserve of the technical and thus the domain of engineering. The matter of waste becomes fixed and limited through management. Caught within a teleological fix, that which is managed as waste is waste, and that which is waste is what is managed.Waste's identification with waste managementöspecifically, its translation into the categories and policies of waste management öis a manoeuvre which places the field firmly in accord with Bruno Latour's`moderns'. In keeping with that we find much work that problematises waste does so at the level of the categorical rather than opening out its ontological politics. So, albeit that there are considerable differences between work which seeks to evaluate policy outcomes (Davoudi, 2000;Petts, 2000;2004) and that which has moved waste debate into the conceptual terrain defined by governance (Davoudi, 2009) and governmentality (Bulkeley et al, 2007;Fagan, 2004), these two force fields within waste scholarship remain firmly in the realms of humans acting on the world (cf Hillier, 2009). In the first body of work, the field is defined by end-of-pipe policy, and focuses on the identification of`barriers to' as the primary means to engage with wa...