They too are not concerned with tree preservation. The arborist is the most skilled person trained in tree preservation. A person wishing to keep their trees is best served by a person trained in arboriculture. The word arbor means tree and culture means civilization. The arborist concerns themselves with the continuance of the tree civilization.
Trees are valuable.
They are very generous in the gifts they give mankind. Trees give us oxygen we breathe, filter the air of pollutants, provide shade, wood, fruits and nuts, absorb sound, provide visual pleasantries, and a place for humans to play under or in. Trees can also become problems as they try to coexist with human beings of this planet. Trees grow old and get sick. They eventually die.