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The United States comprises 5% of the total world population and
Americans use 25% of the world’s energy resources.
Buildings and the building industry consumes between 1/3 and ½ of the nations energy.
Home Size 478 SF/person average floor area 1,500 SF 3.14 people per household In 1950 In 1970 1.6 x 1950 In 2000 2.8 x 1950 297 SF/person average floor area 1,000 SF 3.37 people per household 840 SF/person average floor area 2,200 SF 2.62 people per household