According to the most conservative United States Bureau of Census estimates, our population will increase by over 100 million by mid-century. 2 In order to accommodate this growth, as much as sixty-six percent of the development on the ground in 2050 will be built between now and then. 3 The construction and operation of buildings as well as the VMT for daily work, errands, and pleasure will account for a large percentage of the energy needs by mid-century. The Intergovernmental Panel on Climate Change (IPCC) released its "Fourth Assessment Report" on climate change in 2007. 4 According to this document, global temperatures and sea levels have risen dramatically. 5 In the IPCC's words, these changes are "very likely due to the observed increase in anthropogenic [greenhouse gas] (GHG) concentrations," as global GHG emissions have risen "70% between 1970 and 2004."6 C02 specifically composed 77% of total anthropogenic GHG emissions in 2004, resulting in 38 gigatonnes (Gt) of C02 being released into the atmosphere. 7 As of 2009, CO 2 represents 83% of the total GHG emissions in the Unit-2.

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