STAGE 2 - Manufacturing
Preparing the material for use and measuring the amount of energy needed for raw materials to be manufactured into building materials. This includes the cutting of the trees into the different sizes (2x4, 4x6, etc.), and manufacturing steel and concrete from ore and minerals.

Why Wood?
Compared to a wood 2x4, a steel stud requires 21 times more energy to produce and releases more than 15 times the sulfur dioxide. Producing concrete emits up to three times more carbon dioxide, carbon monoxide and hydrocarbons than manufacturing lumber.