Biological diversity conservation measures are vitally important for urban areas. Scientific research proves that stable ecosystems with successful biocenosis substantially increase the ability of any urban environment to withstand the pollution and human impact of urban environment. At the same time, researchers claim that in general people are less interested in conservation methods that protect wildlife, such as plants, fungi, insects, birds, and small mammals. Therefore, modern urban communities are in need of new innovative ideas on how to attract and sustain biological diversity with a positive impact on the city environment. The project cities, Riga, Bucharest, Burgas, and Mersin, possess a vast variety of biotopes, such as city parks, sea coastline, river banks, and other green zones where biological diversity can be researched and successfully sustained with the help of functional recommendations and for the benefit of all the inhabitants of the city. Designed for two years, and targeting 14–18-year-old young people from Latvia, Romania, Bulgaria, and Turkey, Green City Life aims at developing a set of such recommendations to be used by city authorities and city dwellers. Confronted with the COVID-19 restrictions and other negative effects of the pandemic, the partners could not meet in 2020 in Riga as planned. The time of the project was extended by one year and the final meeting was held online hosted by Riga. In cooperation with the natural sciences and environmental institutions, students studied and researched the biotic, abiotic, and anthropogenic ecological factors, which affect biological diversity in the urban area. The students and teachers made photos of the ecologically beneficial and degrading city territories and objects and presented them at the exhibition at every partner school and later in Burgas. The purpose for that was selecting the territories and object in the city which can be improved. Later 3D models were created to respond to the needs of the urban environment and create the bases for the Set of Recommendations. The Green City Life 3Models feature successful biocenosis, or a community of organisms living together, and can be used for city planning and development in every partner city and over Europe. The innovation reveals itself in analysing and summarizing everyone's experience and next practices and creating a model and a set of recommendations which do not exist in each partner city. Apart from the opportunity to enhance their research, problem solving and analysis skills, the participants will be able to work in teams in a cross-cultural, multilingual environment, by creating a meaningful, sustainable product, which may be used in all the partner states, the young people from different countries of Europe and Turkey will feel empowered and inspired to become socially and environmentally responsible citizens.