Oxygen...

Oxygen is very important for us...

For all human beings or animals...

Oxygen is our lifeblood...

Pure oxygen is not easily available now a days...

The cities are very polluted...

Pollution is everywhere...

No pure air is available...

Plant trees for pure air...

Due to deforestation, there is a huge loss in trees...

Concretisation changes the whole structure of the system...

Nature donates plenty of things to us...

But, Man is a greedy animal...

He only takes from nature, destroys nature for fulfilling his demands...