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Participant City


Helsingborg, one of the oldest cities in the Nordic region, is home to more than 110,000 people. For the fourth time in a row, the city was named the most environmentally friendly city in Sweden. This recognition reflects Helsingborg’s multiple efforts to create a more sustainable and environmentally sound urban environment, underlined by its aim to reach net zero emissions by 2035. This target is also implemented within the city-wide innovation initiative H22 that seeks to make Helsingborg a smarter, more sustainable city. By participating in the “Trees in Cities Challenge”, Helsingborg aims to increase its tree canopy and unlock the benefits that trees and forests in the urban environment provide. Helsingborg exceeded its pledge by more than 10,000 trees, planting over 18,000 trees of 40 different species by the end of 2020. The city continued its commitment to the initiative by pledging to plant an additional 8,000 trees throughout 2021 and creating a dedicated website to promote its efforts and engage citizens.

Participant City


Tirana is the capital of Albania and has around 476,000 residents. Urban sprawl, lack of energy efficiency, air pollution and other environmental issues are some of the challenges the city faces. Tirana is implementing the “Green Local Plan Tirana 2030” including strategies to create a green belt that consists of 2 million trees around the city - the “Orbital Forest” - as well as the creation of two green rings within the urbanized area. In connection with all these greening efforts, Tirana participates in the “Trees in Cities Challenge” and pledged to plant 500,000 new trees. Thereby, the city seeks to enhance the natural environment and biodiversity, improve air quality, increase its resilience to climate change impacts and create a healthier, more livable urban environment. In order to raise the funds needed for tree planting activities, the city relies on crowdfunding and donations from companies and citizens.

Participant City


Barcarena is a city in the Northern state of Pará in Brazil inhabited by around 115,000 residents. The canopy cover in Barcarena is low which is addressed by the city’s participation in the “Trees in Cities Challenge” aimed at improving the living quality of its residents and developing the “Urban Afforestation Plan”. In preparation for the planting activities, Barcarena identified low canopy spaces within its urban area followed by on-site assessments in 70 locations. The city implemented its pledge of 1,000 new trees, planting them along streets and in public areas.