Los Angeles, San Francisco and Houston top the list of U.S. metropolitan areas with the largest number of Energy Star buildings in 2008, according to the Environmental Protection Agency.
Other areas that made the list include: Washington, D.C., Dallas-Fort Worth, Chicago, Denver, Minneapolis-St Paul, Atlanta and Seattle.
Energy Star buildings typically use 35 percent less energy and emit 35 percent less greenhouse gases than average buildings.
In 2008, more than 3,300 commercial buildings and manufacturing plants earned the Energy Star, representing savings of more than $1 billion in utility bills and more than 7 million metric tons of CO2 emissions.
In 2007, the EPA's online energy rating system for commercial buildings started including greenhouse gas emission factors.
