Scientists in Belgrade came up with the idea of “planting” large tanks of water and algae in places where trees can’t grow. The tanks are 10-50x more efficient than a normal tree for the space it takes up and is in general highly sustainable, even creating excellent fertilizer in the process. You can skip about halfway through the video for the actual information about them.
@stabby_cicada @MonkCanatella Lots of ideas for both algae and traditional trees in Bioshelters, Ocean Arks, City Farming: Ecology as the Basis of Design by Nancy and John Todd, both of whom are still around.
Years of links to urban and advanced agriculture at http://cityag.blogspot.com
which is also a listserv
Good looking out with city ag. Adding to my RSS reader, thanks!_Going to have to check out that book sometime, just from the title alone it sounds right up my alley