Urban trees provide critical welfare resources for birds, bats, and invertebrates, and the ongoing removal of urban trees for development threatens these welfare networks.
Urban trees are welfare infrastructure: each mature tree is a habitat for hundreds of species, providing food, shelter, and nesting sites that would otherwise require acres of rural habitat. The removal of a 100-year-old tree for a development project eliminates welfare-supporting resources accumulated over a century. Species that depend on old growth features — woodpecker cavities, bat roosts, lichen communities — cannot simply move to younger trees. The welfare argument for urban tree protection is both direct (for tree-dependent species) and indirect (for the cooling and air quality services trees provide all urban wildlife).