I live in a city with trees, an adult tree normally takes up the space of a big block, you can have maybe 20-30 on a space where 400 live if you cover the stree

I live in a city with trees, an adult tree normally takes up the space of a big block, you can have maybe 20-30 on a space where 400 live if you cover the street. Most likely plants can be more a efficient way. Probably everything fast growing is more oxygen converting, and co2 storing