Green Building Council analyses existing structures for sustainability

Existing structures break down like this ...

• 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), and
• 14% of potable water consumption.

see another post about this here ...http://geospatial.blogs.com/geospatial/2009/07/sustainable-design-for-existing-structures.html