If this catches on and we lose all of the trees I swear I'm gonna lose my shit. Trees aren't just useful for oxygen but also habitats for wildlife. This little square thing isn't gonna supply a home for anything.
and besides, imaging life without trees...your childhood would stop being so amazing. its not like you could say you fell from a device and broke your leg so you wont go to school the next day
By far, the best idea; sadly there still aren't planets to inhabit. Mars seems to be the best option, sadly, the cold there makes the planet unable to be inhabited.
Don't you have like finals now?