These destructive impacts of the design profession and real estate markets spawned, beginning in the seventies, a reactive but also proactive grassroots movement that essentially constituted a revolution against the capitalist building industrys colonization of time. The movement for building preservation has been a distinct entity, quite different from either the green building and recycling movements, but in many ways equally important, operating on the top rung of materials efficiency ladder. The preservation movement expressed peoples love for old buildings, and, as noted at the end of Chapter I, it may have been the only mass popular movement in the last hundred years with any major impact on architecture (Brand, 1994, p. 88). Dovetailing with growth of the preservation movement, the green building movements growing concern with embodied energy (what ecologist Howard Odum called emergy) and life-cycle analysis has sparked a greater recognition of the importance of preservation, and the