The removal of senescing trees or those which pose a genuine risk to health or property is part of professional urban tree management. However, there are many requests for tree removals that are not based on a genuine likelihood of injury or property damage, but rather on an unfounded fear of what might happen or where the tree is considered to be in the way of some other activity. Across Australia, about 97% of requests for tree removals made to local government authorities are ultimately approved. Such a high rate of approvals provides a threat to the fabric of the urban forest.

In many instances, the removal of sound and healthy mature trees has unexpected costs and consequences. The loss of shade can have an effect on the temperature experienced within a dwelling over summer and this may have health consequences in terms of heat-related illnesses if the occupants are elderly. Swelling of reactive clay soils may be exacerbated by a tree removal, which can contribute to problems with footings and foundations and wind damage may also be greater after the removal of a tree than it was when the tree provided a filtering of and shelter from strong wind.

Too often the consequences of removing safe and healthy trees are not fully considered when undertaking the cost-benefit analysis associated with any proposed tree removal. This brief paper provides a framework for decision-making that could be used in defending safe and healthy trees from removal and allows the identification of any unforeseen consequences from such removals.