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Biodiversity loss now ranks as one of the most significant global drivers of environmental change. In an increasingly urbanized world, there is enormous potential to address this problem through conservation, restoration, and creation of new urban ecosystems. This chapter explores how nature-based solutions (NBS) can contribute to addressing the urgent problem of biodiversity loss in a way that goes beyond just greening gray environments. It then explores the alignment (and misalignment) between the ways in which NBS is framed as a nature conservation tool globally and the ways in which biodiversity is considered in urban approaches to NBS. Finally, the chapter explores the ways in which NBS might become an essential part of the solution to biodiversity and ecosystem decline. It discusses how NBS can be effectively leveraged to address the biodiversity crisis in urban areas, through conservation, restoration, and efforts to create thriving places for both people and nature. Although the concept of NBS in urban areas is fairly divorced from its nature conservation origins, reconnecting with those ecological roots is important for creating biodiverse, resilient cities. In so doing, NBS could offer a unified concept for environmental management in urban areas that integrates the ecological benefits of nature conservation with an innovative focus on confronting major societal challenges. Though this is a demanding task, it could provide a fit-for-purpose approach for conserving biodiversity and supporting functional ecosystems in the Anthropocene.

Green space increase in dense urban environments is a recurring goal of contemporary planning and policy making. Nonetheless, there is a need to assess the feasibility of concrete greening implementation in specific contexts. The purpose of this paper is to evaluate and discuss the environmental potential of green roofs in commercial neighborhoods with low green rates.

By studying shopping streets in Shimokitazawa, Tokyo, this research focuses on a commercial area featuring narrow streets, mid-rise buildings and a low amount of green space. A 25ha case study area was sampled and investigated from a morphological point of view, based on mappings, aerial photographs and on-site surveys.

Because of the peculiar morphological characteristics of Shimokitazawa, green roofs are a particularly suitable greening option. If all flat roofs in the case study area were retrofitted with green roofs, green space would increase from 4 to 27.7 percent. Moreover, the area’s carbon footprint would decrease by 2.6 percent.

While maintaining that each location has unique characteristics, the quantification of the environmental benefits of green roofs in Shimokitazawa could be generalized for a number of similar areas within Tokyo and Japan, being a reference for policy making and urban design guidelines.

Urbanisation, environmental sustainability and property markets are intertwined. Consequently, studies on any of these three topics need to take the other two topics into consideration. By critically reviewing 33 hedonic pricing studies in 16 key journals in the urban studies and environmental policies areas, we summarise quantitative evidence on the price of environmental externalities resulting from China's urbanisation process. We find that Chinese residents are willing to pay more for the access to green space and waterbody as well as the treatment of urban pollution. The cost and benefit of these amenities and disamenities have already been capitalised in house prices. The central and local government in China can leverage market force to encourage, support and facilitate sustainable urban development and environmental protection, instead of directly intervening in the property market by using public resources. Meanwhile, the estimated hedonic price of Urban Green, Urban Blue and Urban Grey helps policymakers to understand the cost and benefit of their urban development decisions. Our review of the papers on Urban Green, Urban Blue and Urban Grey suggests that there have been promising and encouraging development in studies on all three topics in the last decade. The quality and quantity of hedonic price research has been improving notably. However, it is also clear that there is virtually no empirical evidence from the second- or third-tier cities, particularly, regarding Urban Green and Urban Blue investigations. The small number of existing hedonic studies is far from sufficient to draw reliable conclusions about the costs of environmental externality for cities that have not been studied. What works in first-tier cities may not hold elsewhere in China due to the large geographical variation in natural endowment, economic development status and local customs. There are many pieces that are missing from this big picture. More hedonic price studies are needed.

As a sustainability initiative with the backing of civil society, business, or government interests, urban agriculture can drive green gentrification even when advocates of these initiatives have good intentions and are aware of their exclusionary potential for urban farmers and residents. I investigate this more general pattern with the case of how urban agriculture became used for green gentrification in Denver, Colorado. This is a city with many urban farmers that gained access to land after the Great Recession but faced the contradiction of being a force for displacement and at risk of displacement as the city adopted new sustainability and food system goals, the housing market recovered, and green gentrification spread. I argue that to understand this outcome, it is necessary to explain how political economy and cultural forces create neighborhood disinvestment and economic marginalization and compel the entrance of urban agriculture initiatives due to their low-profit mode of production and potential economic, environmental, and social benefits. Central to how urban agriculture initiatives contribute to green gentrification is the process of revalorization, which is how green growth machines repurpose such initiatives by drawing on their cultural cachet to exploit rent gaps. I conclude with a set of hypotheses to help other scholars test the conditions under which urban agriculture is more or less likely to contribute to green gentrification. Doing so may help nuance convictions about the benefits of urban agriculture within the context of entrenched inequalities in rapidly changing cities.

Conservation of green space is crucial to the sustainable urban development of China. Nanjing is a central city in the Yangtze River Delta cluster in eastern China. Owing to urbanization, the green spaces in this city have been affected significantly in terms of their scale and structure. Assessing such changes can provide a basis for environmental protection measures and sustainable development. Using Landsat remote-sensing image data from 1998 and 2007, we constructed a distribution map of the patches of green spaces in Nanjing, and analyzed and assessed the changes in scale and spatial layout of the green spaces using various landscape metrics including CA, PLAND, PD, MPS, LPI, NP, PD, TE, ED, MPI, and LSI. Coinciding with a sharp increase in urban population, the area of green spaces in Nanjing decreased by 27.06% between 1998 and 2007. The patches of green space increased by 39%, and the average area per patch decreased by about 47.52%. Green space patches were found to be unevenly distributed among the districts of Nanjing. In urban areas, significant numbers of such patches were found primarily in various types of parks, while in suburban areas, they were concentrated mainly in the hilly forestlands. Green spaces exhibited tendencies towards fragmentation, miniaturization, and discretization.

This paper probes into the relationship between Neighbourhood Parks and their efficiency as a potential stress reliever from the outdoor environment. It consists of the introduction to the relationship between stress and outdoor environment, background research on recent issues of Neighbourhood Park and it then continues with the context of perceiving Neighbourhood Park as a stress reliever. This paper looks into the previous studies that employed observations, survey, interviews and instruments as methods in proving Neighbourhood Parks as a potential stress reliever. Relevant findings were highlighted and recommendations for improving the design and planning were suggested to generate more quality living environment in the future.

Nature-based solutions (NBS) generate different impacts at the urban scale, such as the ability to regulate water or store carbon, comparable to traditional, gray infrastructures in a more cost-efficient way. On the other hand, by their intrinsic nature, NBS do deliver a series of other services that are commonly defined as social, economic, and environmental cobenefits. These benefits are not always valued in a consistent and complete way, so there is the need to compile a more comprehensive evidence base on the social, economic, and environmental effectiveness of NBS. The chapter attempts to identify a categorization of the existing NBS and define the ecosystem services (ES) provided by them. Furthermore, starting from the results achieved through the definition of the existing NBS frameworks assessment, the chapter will identify a set of key performance indicators KPIs, based on the ES produced by NBS, to measure the economic, social, and environmental benefits generated in by NBS at the urban level taking into account their multifunctional character. In total, 66 key performance indicators have been individuated: 3 for provisioning services, 38 for regulating services, 17 for cultural services, and 8 for supporting services. Each indicator has been associated to a category of ES in order to measure and evaluate the performances of NBS implemented in cities.

Applying the practices of ecotourism to an urban environment is a relatively new concept but a concept that merits development in multiple cities. The concept of urban green tourism (urban ecotourism), as pioneered by Toronto’s Green Tourism Association, is a working example that demonstrates how a city can promote itself, individual businesses and attractions to provide a unique tourism experience and generate demand for sustainability. This paper seeks to outline how urban green tourism can be an effective approach to addressing the issues of tourism in cities – growth, waste, etc., and demonstrates how sustainable tourism options can capitalize on the existing features of a city. The association promotes local businesses, organizations, natural and cultural features through its green map, green guidebook and Website to educate travellers and industry toward greener practices.