As we all can observe high buildings all around., Great!!!!!This is a sign of development but only when these are surrounded by lush green plants or atleast a tree outside every building., Remember,the plants are the ultimate source of oxygen -the praan vayu.Aldo the inhab for birds ., In the scorching heat,they are the source of shadow for many,the callers for rain ., Directly or indirectly affecting all aspects of ecology.