See my previous post, ya dope. Trees in urban areas reduce the ambient temperature as they work as a heat sink. They also have an aesthetic value (that means they look nice, in case you were wondering).
It's a disgrace because outside of a couple of hours in the mornings and evenings when buses might actually be full, the Boreenmana Road isn't a traffic blackspot that needs dedicated bus lanes in both directions. Any time I see the 215A during the day there are only a handful of people on it. Same for most other routes on the southside now that I think of it.
But yeah, totally worth chopping down all the trees