L.A. tops the list for most energy-efficient buildings in the U.S.

In major cities across the United States, most of the energy consumed is from corporate buildings. According to the Environmental Protection Agency (EPA), if cities are going to seriously reduce the amount of greenhouse gases that they release into the atmosphere on a yearly basis, there must be a concerted effort to retrofit existing spaces with green technology. In New York City, for example, 80 percent of the city's carbon dioxide emissions come from buildings. Without a serious shift, global climate change cannot be reversed.

There is a silver lining, however: More and more cities in the U.S. are cutting down on their wasteful energy habits, as leaders and advocates have encouraged construction companies and real estate developers to design and construct buildings that are much less wasteful. Since 2009, over 20,000 buildings across the country have earned the EPA's Energy Star rating, which measures the efficiency of a space to comparable buildings in the U.S. Buildings are ranked on a 100 point scale, with anything higher than a 75 getting the Energy Star rating.

Earlier this week, the EPA released a list of the 10 U.S. cities that had the most energy-efficient buildings in 2013. Los Angeles topped the list at 443, followed closely by Washington, D.C., with 435. Atlanta, Georgia (318), New York City (303), and San Francisco (291) rounded out the top five. This marks the sixth year in a row that Los Angeles has topped the EPA's list. In total, 7,000 buildings got the Energy Star rating from the EPA, representing a saved total of 7.3 million tons of greenhouse gases from being emitted into the atmosphere.

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