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Costs and benefits of green climate adaption measures in Bremen: Street trees

The climate adaptation strategy for Bremen and Bremerhaven identifies, among other things, ten key climate change adaptation measures for the municipality of Bremen. This includes the "Action Concept Urban Trees", which includes an increase in the number of street trees. Street trees provide a variety of ecosystem services (ESL). They provide shade on hot days, evaporate water and can thus cool the neighborhood in hot weather. Rainwater can percolate in the areas around the trees. They also retain climate-damaging carbon dioxide (CO2) and other air pollutants, improve the cityscape and provide a habitat for animals. The BREsilient project conducted a cost-benefit analysis on selected green adaptation measures.

In this fact sheet, the costs of planting and maintaining additional street trees in Bremen are compared to their benefits. The multiple benefits, mainly as a result of non-market effects, were captured using various cost and preference-based economic valuation methods. The result shows that it is economically very advantageous to plant additional street trees for Bremen. The large monetary benefit results in particular from the high appreciation of Bremen citizens for the positive effect of trees on the cityscape and habitat function, which was determined in a representative population survey using a choice experiment. 

Another fact sheet provides information on the costs and benefits of green roofs and open spaces. An overall framework fact sheet provides a general overview of the cost-benefit analysis for selected key measures of Bremen's climate adaptation strategy.