Researches and scientists' data show us that an area of 18.1 million square kilometers have been modified for buildings and constructions, around the world.
This area is considered as the missing soil on the Earth's surface (like our skin) which has been left uncovered since the first house was built in Tanzania, since the first factory was built in the United States and since the first sales of land for commercial purposes.
Is it a responsibility to return the missing soil back to the roofs of buildings for "MORE OXYGEN"? (About 14.5 million square kilometers, 80% of 18.1 million square kilometers have been modified).
Why?
Because only trees can produce natural oxygen, right?