The Pennsylvania Landscape & Nursery Association has produced an incisive report on the value of green infrastructure projects in an urban environment.
From the introduction:
We often don’t think of green infrastructure – the use of trees and plants – when we think of traditional infrastructure development such as roads, bridges, schools and hospitals and other public works. Rather than address urban environmental concerns as an afterthought to traditional infrastructure repair and replacement, we should build the environmental solution into projects from the beginning through the use of green infrastructure components. In many cases, the return on investment (ROI) of green infrastructure will be greater than traditional “bricks and mortar” solutions.