* 38% מפליטות הפחמן הדו חמצני.<ref>[http://www.epa.gov/greenbuilding/pubs/gbstats.pdf/ ''Buildings and the Environment: A Statistical Summary''] U.S. Environmental Protection Agency, December 2004</ref>
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* 38% מפליטות ה[[פחמן דו חמצני|פחמן הדו חמצני]].<ref>[http://www.epa.gov/greenbuilding/pubs/gbstats.pdf/ ''Buildings and the Environment: A Statistical Summary''] U.S. Environmental Protection Agency, December 2004</ref>