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Green areas above city roofs
How is the express car adapted to nature?
Water for wetlands – not for fields and cellars
I've never recycled, and I don't recycle now - would it be worth it, though?
A protected area was created from the former gravel extraction area
Waste-free construction site - a utopia?
In ethical questions, open discussion and joint reflection are essential
Common principles are derived by acting as an example
Open your eyes to influence efforts and see through the eyes of an outsider