2% of all CO2 released into the atmosphere is related to buildings. This figure varies from one source to the next. Some place the percentage of emissions from buildings as high as 33%. What most of these figures do not address is the actual cause of the CO2 emissions. In newly constructed buildings, production of materials used in building and energy used during construction are sited as the cause of carbon dioxide emissions. In existing buildings the CO2 created by the energy upkeep of the building is the root of the emissions quotient. The general comparison is that buildings consume energy in the way that cars burn fuel. But the pollutants created in providing power for heating, air-conditioning, lights and other usage in buildings has already been factored. Honestly this double billing accounting is more the product of auto manufacturers looking to point the blame for global warming away from gas guzzling cars.

The point to remember is that 98% of all CO2 emissions are related to energy production and 80% of these emissions become greenhouse gases.

More Info at http://globalwarming.com