It takes great skill and training to safely and competently remove a tree. This is especially the case when a tree needs to be climbed. Having a team that knows how to dismantle a tree without incident is crucial.
Perhaps a tree needs to be removed if it is dead, dying or diseased. Making room for a building or extension, solar panels requiring light, removing weed species to re establish native species, structural damage being caused by roots… Like retaining a tree there are many reasons for which a tree requires removal.