Nature-Based Solutions Forming Urban Intervention Approaches to Anthropogenic Climate Change: A Quantitative Literature Review

Pre-Existing Interventions as NBS Candidates to Address Societal Challenges

The nature-based solutions (NBS) concept is an umbrella term that connects and organizes previous concepts from the ’green-concept family’. Therefore, interventions similar to NBS were used for a long time before this term was first introduced. Such pre-existing actions, to be considered as NBS, must meet the Global Standards formulated by the Union for Conservation of Nature Global Standards. One of these standards refers to the challenge-orientation of NBS. The aim of this study was to propose objective criteria that enable the assessment of the challenge-orientation of such interventions. To this end, a set of criteria referring to the seven societal challenges was presented. A Lublin city (Poland) case study was applied in relation to 24 types of interventions. The results showed that all of the analysed pre-existing actions met at least two of the challenges. The actions with the greatest challenge-orientation potential continuity for ecological networks are: protecting surface wetlands, public parks, allotment gardens, restoring waterbodies and maintaining floodplains, and the lowest potential are: creating nesting boxes for bats and insect hotels, installing apiaries and below-ground rainwater collection systems. The analysed interventions responded, to a greater extent, to challenges such as to human health, climate change adaptation and mitigation and ecosystem degradation/biodiversity loss, and, to the least extent, to food security and socioeconomic development Moreover, the study revealed that the scale of the pre-existing intervention type is too general to draw conclusions regarding its challenge-orientation: each piece of the intervention should be assessed separately in relation to the conditions in the local context.

Urban Forests and Green Areas as Nature-Based Solutions for Brownfield Redevelopment: A Case Study from Brescia Municipal Area (Italy)

Urban areas are experiencing major changes and facing significant sustainability challenges. Many cities are undergoing a transition towards a post-industrial phase and need to consider the regeneration of brownfield sites. Nature-Based Solutions (NBSs) are increasingly considered as tools for supporting this transition and promoting sustainable development by delivering multiple ecosystem services (ESs). Although the potential of NBSs as a cost-effective enabler of urban sustainability has been recognized, their implementation faces numerous barriers. The effective assessment of benefits delivered by urban NBSs is considered by existing literature as one of them. In order to contribute to filling this knowledge gap, we analyzed two alternative NBS-based intervention scenarios—i.e., (1) an urban forest and (2) meadows with sparse trees—for the redevelopment of an urban brownfield area within the municipality of Brescia (Northern Italy). Nine ESs were assessed both in biophysical and economic terms via a combination of modeling (InVEST, i-Tree and ESTIMAP) and traditional estimation methods. The results show that both scenarios improve ES stock and flow compared to the baseline, ensuring annual flows ranging between 140,000 and 360,000 EUR/year. Scenario 1 shows higher values when single ESs are considered, while scenario 2 shows higher total values, as it also accounts for the phytoremediation capacity that is not considered under the first scenario. All in all, regulating ESs represent the bulk of estimated ESs, thus highlighting the potential of proposed NBSs for improving urban resilience. The ES assessment and valuation exercise presented within this paper is an example of how research and practice can be integrated to inform urban management activities, and provide inputs for future decision making and planning regarding urban developments.

Spatial Planning and Climate Adaptation: Challenges of Land Protection in a Peri-Urban Area of the Mediterranean City of Thessaloniki

The growing interest in climate change and related risks has triggered efforts to address both its causes and impact. Climate action is mainstreamed in various public policies in which spatial planning has a key role and operates as a coordinating framework as well as one that enables specific interventions. At the same time, land, an indispensable element of spatial planning, is gaining attention as a natural resource that is closely related to climate change. Increasing need for land protection raises the need for a renewed role of spatial planning of all types and levels. This paper examines issues of land protection related to climate change in a peri-urban area of the Thessaloniki metropolitan area in Greece and seeks to identify how the types of spatial planning contribute to land protection. It is argued that when viewing land protection from a climate adaptation perspective, a renewed relationship between the types and levels of spatial planning that demands emphasis be placed on their cooperation and the enabling of novel approaches such as nature-based solutions becomes apparent.

A Hybrid Method for Citizen Science Monitoring of Recreational Trampling in Urban Remnants: A Case Study from Perth, Western Australia

Vegetation trampling that arises from off-trail excursions by people walking for recreation can negatively impact the structure of understory plants in natural spaces that are an essential element of urban green infrastructure in a modern city. In addition to reducing the esthetic quality and environmental values of urban remnant and replanted native vegetation, such trampling reduces the habitat that supports wildlife populations within the urban fabric. This case study draws upon several disparate methods for measuring vegetation structure and trampling impacts to produce a hybrid method that community-based citizen scientists (and land managers and other researchers) could use to simply, rapidly, and reproducibly monitor how trampling associated with urban recreation trails impacts the structure of understory vegetation. Applying the novel hybrid method provided evidence that trampling had reduced the vegetation structure adjacent to a recreational walking trail in an urban woodland remnant in Perth, Western Australia. The hybrid method also detected ecological variability at the local ecosystem-scale at a second similar woodland remnant in Perth. The hybrid sampling method utilized in this case study provides an effective, efficient, and reproducible data collection method that can be applied to recreation ecology research into aspects of trampling associated with trail infrastructure.