Inclusion. 75 cities, 22 states and two federal agencies have instituted policies requiring or encouraging new construction to achieve some sort of "green" certification (LEED, Green Globes or an equivalent).
Growth. Green building has been one of the few bright spots in an otherwise dreary construction market.
Efficiency. For example, converged and standardized cabling requires less material and fewer pathways, thus saving energy.
Economics. Another example: HMI-displayed energy efficiency readouts may assist the owner in earning LEED-based tax credits.
Liability. If a green measure or piece of equipment underperforms, thus endangering green certification, your company may be liable.
Responsibility. Removing waste of motion, time, energy and resources from every step in a process helps the environment.