Parking lots in cities take up far more of the available open space than do parks and places allocated for people. Park(ing) day is an annual campaign where people across the world temporarily

Plastic Free Challenge is a playful competition to become aware of the amount of single-use plastics in our everyday life and to find respective alternatives to avoid it. It can be organised as a

Mobile trees on the street

Where streets are grey with concrete, and quickly heating up in summers, Mobile Tree Alleys can be a good solution to provide green and shade, to filter dust