Wood is the most energy-efficient building material available today.
When you compare the total energy costs of different kinds of building materials,
including the cost to acquire the raw material, transport it, process it
into a useful product and then actually use it, wood far outshines its competitors.
Energy Comparison of Wood Products and Equivalent Non-Wood Substitutes
Million BTU per ovendry ton

Steel wall studs require almost 9 times more energy to produce than 2x4
wood studs. A brick veneer wall requires 22 times more energy than wood
siding, while alumi-num siding requires 5 times more energy and results
in 8 times the air pollution emissions and 300 times the water pollution
emissions. A concrete floor requires 21 times more energy to produce than
an equivalent wood floor. Concrete production also results in 5 times more
solid waste and emits 2-3 times more carbon dioxide, carbon monoxide and
hydrocarbons than equivalent wood products.
The U.S. uses more tons of wood annually than concrete, steel and plastic
combined. For every billion board feet of wood we use instead of other building
materials, we're saving 720 million gallons of oil and preventing 7.5 million
tons of carbon dioxide emissions from entering our atmosphere!
Woody Biomass Forest Issue Brief (pdf, 125kb) NEW