This is one idea…

It’s called Urban Air:

Urban air transforms existing urban billboards to living, suspended bamboo gardens. Embedded with intelligent technology, Urban Air becomes a global node – an open space in the urban skyline… An artwork, a symbol, and instrument for a green future.

Charles Mudede—who writes about film, books, music, and his life in Rhodesia, Zimbabwe, the USA, and the UK for The Stranger—was born near a steel plant in Kwe Kwe, Zimbabwe. He has no memory...