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      Circular cities

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      Urban Studies
      SAGE Publications

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          Abstract

          A circular approach to the way in which we manage the resources consumed and produced in cities – materials, energy, water and land – will significantly reduce the consumption of finite resources globally. It will also help to address urban problems including resource security, waste disposal, greenhouse gas emissions, pollution, heating, drought and flooding. Taking a circular approach can also tackle many other socio-economic problems afflicting cities, for example, providing access to affordable accommodation, expanding and diversifying the economic base, building more engaged and collaborative communities in cities. Thus it has great potential to improve our urban living environments. To date, the industrial ecologists and economists have tended to dominate the circularity debate, focusing on closed-loop industrial systems and circular economy (circular businesses and systems of provision). In this paper I investigate why the current state-of-the-art conceptualisation for circular economy (RESOLVE) is inadequate when applied to a city. Through this critique and a broader review of the literature I identify the principles and components which are lacking from the circular economy (CE) conceptualisation when applied to a city. I then use this to develop my own definition and conceptualisation of a circular approach to urban resource management.

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          The value of the world's ecosystem services and natural capital

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            Global forecasts of urban expansion to 2030 and direct impacts on biodiversity and carbon pools.

            Urban land-cover change threatens biodiversity and affects ecosystem productivity through loss of habitat, biomass, and carbon storage. However, despite projections that world urban populations will increase to nearly 5 billion by 2030, little is known about future locations, magnitudes, and rates of urban expansion. Here we develop spatially explicit probabilistic forecasts of global urban land-cover change and explore the direct impacts on biodiversity hotspots and tropical carbon biomass. If current trends in population density continue and all areas with high probabilities of urban expansion undergo change, then by 2030, urban land cover will increase by 1.2 million km(2), nearly tripling the global urban land area circa 2000. This increase would result in considerable loss of habitats in key biodiversity hotspots, with the highest rates of forecasted urban growth to take place in regions that were relatively undisturbed by urban development in 2000: the Eastern Afromontane, the Guinean Forests of West Africa, and the Western Ghats and Sri Lanka hotspots. Within the pan-tropics, loss in vegetation biomass from areas with high probability of urban expansion is estimated to be 1.38 PgC (0.05 PgC yr(-1)), equal to ∼5% of emissions from tropical deforestation and land-use change. Although urbanization is often considered a local issue, the aggregate global impacts of projected urban expansion will require significant policy changes to affect future growth trajectories to minimize global biodiversity and vegetation carbon losses.
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              Ecosystem services in urban areas

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                Author and article information

                Journal
                Urban Studies
                Urban Studies
                SAGE Publications
                0042-0980
                1360-063X
                November 28 2018
                October 2019
                January 23 2019
                October 2019
                : 56
                : 13
                : 2746-2762
                Affiliations
                [1 ]University College London, UK
                Article
                10.1177/0042098018806133
                1a278dfc-dcc7-4d3e-b71c-0d345eb50de9
                © 2019

                http://journals.sagepub.com/page/policies/text-and-data-mining-license

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