But why not just like… Do that somewhere where the mass actually makes a difference? You’d be better off dumping acres full of this shit instead of regrowing a forest. Doing it in individual tanks, sparsely within a city, is both an inefficient use of resources and fucking ugly.
Trees only purpose in a city is not to clean out CO2. It’s not even their primary purpose in a city. If it was, they’d be selecting specific species etc.