The building sector not the transportation sector is responsible for the largest consumption of fossil fuels and natural resources in the world today. According to this independent survey. 
U.S. CO2 Emissions by Sector
Source: U.S. Energy Information Administration statistics
Architecture2030.org explains that combining the annual energy required to operate residential, commercial, and industrial buildings along with the embodied energy of industry-produced building materials like carpet, tile, glass, and concrete exposes buildings as the largest energy consuming and greenhouse gas emitting sector. (Seems to makes sense when you combine such a large list of energy needs.)
U.S. Energy Consumption by Sector
Source: U.S. Energy Information Administration statistics
After looking at this study - Is there a need for massive change in the way architects design buildings? The building community (according to this calculation) is responsible for almost half of all U.S. greenhouse gas emissions annually. Globally the percentage is even greater.
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