According to some people, trees should be planted in the unoccupied areas of major towns and cities. Others insist that it is more important to building residential complexes there. In my opinion, planting trees in the vacant areas of cities is of greater significance than building homes there.
Planting trees makes the surroundings cleaner and healthier. If the empty regions are filled with trees, it adds greenery and scenic beauty to the place. These places will attract small birds and butterflies which in turn will make it a calm ecosystem in itself. Moreover, trees add oxygen into the atmosphere through photosynthesis and thus increase the quality of air. The health of the residents will improve by breathing this fresh, non-polluted air. Overall, planting more trees keeps the environment pure and natural.
On the other hand, constructing residential buildings in all vacant regions will cause congestion. Transforming every available land into residential space will lead to the formation of concrete jungles. There will be no place left to plant trees and it will harm the purity of air. In many cities such as Hong Kong, the residents are suffering due to the overcrowding of people, and more and more people are shifting to the suburbs. Hence, filling all empty spots with metal and concrete is a bad decision.
In conclusion, I am of the opinion that / I opine that all the vacant spaces should be utilized for afforestation. This will help to enrich the area with pure air and oxygen which in return helps the people to have a healthy life. 
According to  
some
  people
,  
trees
 should  
be planted
 in the unoccupied areas of major towns and cities. Others insist that it is more  
important
 to building residential complexes there. In my opinion, planting  
trees
 in the vacant areas of cities is of greater significance than building homes there.
Planting  
trees
  makes
 the surroundings cleaner and healthier. If the empty regions  
are filled
 with  
trees
, it  
adds
 greenery and scenic beauty to the place. These places will attract  
small
 birds and butterflies which in turn will  
make
 it a calm ecosystem in itself.  
Moreover
,  
trees
  add
 oxygen into the atmosphere through photosynthesis and  
thus
 increase the quality of  
air
. The health of the residents will  
improve
 by breathing this fresh, non-polluted  
air
.  
Overall
, planting more  
trees
  keeps
 the environment pure and natural. 
On the other hand
, constructing residential buildings in all vacant regions will cause congestion. Transforming every available land into residential space will lead to the formation of concrete jungles. There will be no place  
left
 to plant  
trees
 and it will harm the purity of  
air
. In  
many
 cities such as Hong Kong, the residents are suffering due to the overcrowding of  
people
, and more and more  
people
 are shifting to the suburbs.  
Hence
, filling all empty spots with metal and concrete is a  
bad
 decision. 
In conclusion
, I am of the opinion that / I opine that all the vacant spaces should  
be utilized
 for afforestation. This will  
help
 to enrich the area with pure  
air
 and oxygen which in return  
helps
 the  
people
 to have a healthy life.