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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 love it!
But I've never seen a similar protect (using plants) that could withstand strong winds (100~200km/h).
I mean, the solution is called a self-sustaining forest, but cities don't like that until post apocalyptic times.
-- @Evil_Shrubbery
Well yes, you would.
My evil plans of total shadification revealed!!