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Generate shadows without trees: vegetable awnings, a new way to generate shadows in the city.
(www.singulargreen.com)
I found these kind of cool as an idea, as they can be added rather easily to existing cities and provide some greenery without taking up space, while providing shade:
I grow up next to an old medieval town. I'm not a stranger to how these towns are build. There are a lot of places where you can plant trees in the streets. Of course, the streets will be narrower with the place for just the pedestrians, bikes, and emergencies services. It's a fully car free town in this case. Your link is perfect. You have Pl. de España on the right where you could plant a small forest on it.
You see all the terrasses. They could have trees in the middle.
For this purpose of reducing the temperature, you have this project where they will keep a central bus stop but plant many trees to cover it.
That might be me having a bit of a skewd idea of what having trees everywhere means. Still too many cars though and obviously relatively new.