* 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> | * 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> |