From the Green Building Council:

The built environment has a profound impact on our natural environment, economy, health, and productivity.

In the United States alone, buildings account for:
•    72% of electricity consumption
•    39% of energy use
•    38% of all carbon dioxide (CO₂) emissions
•    40% of raw materials use
•    30% of waste output (136 million tons annually)
•    14% of potable water consumption