Wood incorporated into construction is considered a carbon stock. Transportation in the wood supply chain generates CO2, which reduces its net stock. Based on IBAMA's data from 2007 about origin, destination and volume of the Amazon sawn wood transported nationally, the average distance traveled was estimated at 1,956 km. Diesel consumption factors between 0.005 L/t.km and 0.017 L/t.km, equivalent to emission factors of 12.8gCO2/t.km to 50.6 gCO2/t.km, were identified in the literature and in surveys undertaken in this investigation. To quantify CO2 emission, four categories of freight trucks were evaluated, with different load weight capacities. Wood density influenced variability in the final results by up to 210%; the vehicle weight itself from 30% to 43%. A 1,000 km route with different sawn wood densities reduced carbon stock by 1.4% to 6.1%; GHG Protocol data resulted in values from 20.1% to 24.2%. In 2007, legal transportation of Amazon wood contributed to the Brazilian diesel consumption at an estimated 0.16% to 0.56%; the Brazilian CO2 emission based on 2005 data, is estimated at 0.12% to 0.46%. The net carbon stock of sawn wood, relative to IBAMA's 2007 data, considering just stock reduction from transportation, would potentially result at between 4.77 and 5.19 x 106 tCO2.
Wood; Carbon; Energy; Transportation; Climate change
