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Urban ecosystems rely on large subsidies of imported water, nutrients, food and other resources. Compared to other natural and artificial ecosystems human population density is high, and their interaction with the different patch types produces emergent properties and complex feedbacks among ecosystem components.
Urban development has caused green spaces to become increasingly fragmented and has caused adverse effects in genetic variation within species, population abundance and species richness. Urban green spaces that are linked by ecosystem corridors have higher ecosystem health and resilience to global environmental change. [67]
Ecological urbanism has been criticized as an idea that is loosely defined from a set of flashy projects. These are expensive schemes with a commercial and esthetic purpose that satisfy a local or regional ambition to invest in ecology or sustainability without posing a more globally applicable approach.
According to Timothy Beatley, [2] it is an attempt to shape more sustainable places, communities and lifestyles, [3] and consume less of the world's resources. [4] [5] Urban areas are able to lay the groundwork of how environmentally integrated and sustainable city planning can both provide and improve environmental benefits on the local ...
Related to sustainable urbanism is the Ecocity or Ecological Urbanism movement which is another approach that focuses on creating urban environments based on ecological principles, and the resilient cities movement which focuses on addressing depleting resources by creating distributed local resources to replace global supply chain in case of ...
Ecological classification or ecological typology is the classification of land or water into geographical units that represent variation in one or more ecological features. . Traditional approaches focus on geology, topography, biogeography, soils, vegetation, climate conditions, living species, habitats, water resources, and sometimes also anthropic factors.
The term nature-based solutions was put forward by practitioners in the late 2000s. At that time it was used by international organisations such as the International Union for Conservation of Nature and the World Bank in the context of finding new solutions to mitigate and adapt to climate change effects by working with natural ecosystems rather than relying purely on engineering interventions.
Good urban water management is complex and requires not only water and wastewater infrastructure, but also pollution control and flood prevention. It requires coordination across many sectors, and between different local authorities and changes in governance, that lead to more sustainable and equitable use of urban water resources. [51]