Technological

Revitalization of a large urban park in the Walle and Gröpelingen districts of Bremen. The current park constitutes a neglected area of the former port and shipyards sites with around 4,000 small garden parcels.The local government consulted with numerous societal actors the envisioned project, which aims at the revitalization of the park's both green and blue infrastructure. The goal of the intervention is to create a large recreational park for the districts of Walle and Gröpelingen, which will improve the image of the districts, help with their economic revitalization and provide sustainable practices for urban green care and community gardening (Ref. 2, 3). "Between September 2017 and September 2020, the Green West of Bremen was the focus of the federally funded project "Green Urban Labs" (Ref. 5). As of 2020, "Several of these building blocks have already been started or implemented and have led to an improvement in the cooperation between the actors on site, to an upgrading of the infrastructure and biotopes as well as to an increase in the popularity of the previously rather unknown area" (Ref. 5).

A local government-led project of the renaturalization of the part of the Weser river shore. The initiative aimed to restore part of the river bank to its natural state and to create habitats for the typical local flora and fauna. Additionally, a sand beach for the public was created. The project aimed to increase biodiversity, increase the river shore protection and water management, as well as to improve public access to the recreational area at the water and the attractiveness of the river landscape (Ref. 1, 2, 5).

A private investment project that aimed to create a new building complex in the Findorff district of Bremen and build two large residential buildings "Münchner Bogen" and "Findorffer Tor" with green roofs on top. The green roofing of the buildings was influenced by the local actors - the alliance "Green Bremen" and the advisory board of the Findorff Council. The initiative aimed to contribute to sustainable urban development by the positive impact on biodiversity, rainwater retention, improved local air quality and provision of natural thermoregulation for the buildings (Ref. 1, 2, 3).

A project of the local government developed with EU and federal funds that aimed at the development of the green and beach area in the course of the refurbishment of the flood protection system. The initiative sought to provide a model project for urban flood protection, which can showcase that flood protection measures do not require a separation between city and water and new recreational spaces at the water and shore can be created instead. The project involves redevelopment of the shore area, enlargement of the public space at the shore with additional sand deposit and greenery planting (Ref. 1, 2). The bank area with a beach and recreational facilities opened in May 2019 (Ref. 5).

The Belvedere College Urban Farm is run by students from the school and by the Urban Farm start-up. The complex consists of a greenhouse and an open farm, both situated on the rooftop of Belvedere College. The project serves as a testing ground for researching sustainable farming practices, provides education and practical experience on the topic to students, and is part of a collaborative food network in the local area. (ref 1, 7, 8)

The project of building 100 butterfly booths in different locations of the city developed by BUND Bremen in cooperation with the Botanical Garden, Stadtgrün Bremen and implemented jointly with the citizens. The project additionally involved plantings of flowers and educational activities. It aimed at increasing biodiversity, increasing the protection of the endangered butterfly species as well as providing care instructions for the care of butterflies for the residents of Bremen (Ref. 2, 3).

The renaturalization of the water canal Hirtenbach project was part of the larger city-wide initiative that aimed at the naturalization of different parts of the city's drainage system including small trenches and streams. The initiative aimed to decrease the risk of floods, improve the water quality, protect the local flora and fauna from the pollution, as well as provide for an additional recreational area for the citizens. (Reference 1)
In 2000, natural remodelling or the creation of near-natural structures began in sections. A 20, 000 m3 retention basin was also built. These actions improved flood protection and ecology of the area, and it provided local recreation opportunities. However, a study conducted in 2014 revealed that the restoration measures brought positive changes, but it was not enough to achieve a “good water status” defined by the European Water Framework Directive. Intensive care from silting and lush plant growth, wide margins, and the reduction of nutrients coming from the drainage and agriculture, need to be addressed. (Reference 2)
A new landscape is expected to be created when the alder trees grow. Waterbirds and waders, as well as insects like dragonflies, bees, butterflies and crickets, have been observed in the area (Reference 3).
The large drainage system of the city of Hannover includes many small trenches and streams with a total length of 152 kilometres. The intervention in Hirtenbach involved renaturalization worked on the total length of approximately 10,5 km (of which 3,3 km in the urban area). (Reference 2)

Green roofs were created on vehicles in the Spanish cities of Barcelona, Girona, Córdoba, Valencia. This initiative is based on the project of Marc Grañén, who developed PhytoKinetic a project for the development of moving gardens. (ref 1) The city of Palma de Mallorca was also considering its introduction as a measure of sustainability. (ref 1) The intervention, however, remained in the pilot stage (ref 1 and 4).

“The Sintra Parks concluded the project of recovery of the English Garden, in the Park of Pena, that aimed to stop the advanced state of degradation of this area and to solve situations that represented a risk to the mobility and safety of the visitors.” (ref 1)
The NBS includes planting trees to regrow the tree cover of the area. (ref 1)

The project is a close-to-nature maintenance concept that combines the diverse usage requirements in public green spaces and the promotion of biological diversity through near-natural care. (Reference 1) It aims to promote biodiversity in the area through the plantings of local trees, installation of deadwood stacks, dry stone walls and boulders, which will help in the increased interconnectedness of the green areas and provide for structured habitat for the local species. The initiative also involves development of ecological standards for the handling of green spaces in the country, such as natural care practices that will protect local biodiversity (e.g. adapted mowing regime for lawns, flower meadows). (Reference 1, 2)
The "Urban green - species-rich and diverse" project is a cooperation project of the alliance "Municipalities for Biological Diversity eV" (Alliance) and the German Environmental Aid eV and with the participation of the five partner municipalities Frankfurt am Main, Hanover, Wernigerode, Kirchhain and Neu- Response. The project is funded in the Federal Biodiversity Program by the Federal Agency for Nature Conservation with funds from the Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety. The experiences and results of the pilot project are further incorporated into the maintenance requirements for public green spaces in the urban area in other municipalities (Reference 1, 7).