I have been the President of CORRIM, a consortium of 15 research institutions organized to develop comprehensive life cycle inventory measures of all inputs and outputs for wood uses. Life cycle assessments for completed buildings characterized by risk indices on total and fossil energy use, global warming potential and measures of toxicity to air and water demonstrate many ways to substantially reduce the embodied energy in residential and light commercial buildings. Forest management treatments, material selection, biofuel use, processing change and structural design can all substantially reduce energy use and carbon emissions.