Center for American Progress released an impressive report that describes how we can possibly meet carbon emission reduction targets in a practicle way. Retrofitting 40million to see 20-40% energy use reductions is possible with technology available today. What is needed are financing tools to help building owners invest in efficiency retrofits. The Climate bill currently being considered in Congress contains some of these tools.
download executive summary and full report here:
http://www.americanprogress.org/issues/2009/08/rebuilding_america.html