A number of sources are now confirming the huge impact of buildings on the environment.
When both embodied and operational emissions are accounted for, most estimates seem to fall between 30 and 40%, although some studies indicate it is even higher.

“Worldwide, 30-40% of all primary energy is used in buildings.” United Nations Environmental Program, 2007

“The commercial and residential building sector accounts for 39% of carbon dioxide (CO2) emissions in the United States.” United States Green Building Council, 2009

“According to the U.S. Energy Information Administration (EIA), nearly half (46.7%) of all CO2 emissions in 2009 came from the Building Sector.” Architecture 2030, 2011

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