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.
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