Life cycle assessment of utilizing freshly cut urban wood: A case study |
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| Affiliation: | 1. Lewis Honors College, University of Kentucky, 1120 University Drive, Lexington, KY 40526, USA;2. Department of Forestry and Natural Resources, University of Kentucky, 730 Rose Street, Lexington, KY 40546, USA;3. Department of Agricultural Economics, University of Kentucky, Lexington, KY 40546, USA;4. Instituto de Bosques y Sociedad, Facultad de Ciencias Forestales y Recursos Naturales, Universidad Austral de Chile, Campus Isla Teja, Valdivia, Los Ríos, Chile;1. University of Agriculture in Kraków, Department of Forest Resources Management, Al. 29 Listopada 46, 31-425 Kraków, Poland;2. Department of Forest and Wood Products Economics and Policy, Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemědělská 3, 613 00 Brno, Czech Republic;3. University of Agriculture in Kraków, Department of Management and Economics of Enterprises, Al. Mickiewicza 21, 31-120 Kraków, Poland;1. Department of Forest, Rangeland, and Fire Sciences, College of Natural Resources, University of Idaho, Moscow, ID;2. U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, Moscow, ID;3. Confederated Tribes of the Colville Reservation;4. Intertribal Timber Council;5. U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, Moscow, ID;6. Science Systems & Applications, Inc. (SSAI), NASA Goddard Space Flight Center, Greenbelt, MD;7. NASA''s Carbon Monitoring System (CMS) Initiative;1. Forest Research Centre, Southern Cross University, Military Rd, Lismore, NSW, Australia;2. Silviculture Research Institute, Vietnamese Academy of Forest Sciences, 46 Duc Thang, Bac Tu Liem, Hanoi, Viet Nam |
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| Abstract: | Large amounts of urban wood resources are generated through tree removals in urban areas. Therefore, there is a growing interest to improve the environmental performance of the urban wood supply chain by quantifying the environmental impacts of creating high-value products from urban tree removals to enhance its utilization. By surveying existing urban wood utilization operations for primary data in two major cities: Baltimore, Maryland, and Milwaukee, Wisconsin, a new life cycle inventory (LCI) dataset per m3 of dry urban hardwood lumber and live edge slabs was created. Incorporating the new LCI data into life cycle assessment method, the total global warming (GW) impact of converting urban trees to kiln-dried lumber was estimated to be 122 kg CO2 eq and 336 kg CO2eq per m3 of lumber produced for Baltimore and Milwaukee, respectively. In both cases, the total environmental impact of the product was dominated by the conversion of urban trees to kiln dried lumber at the sawmill processing stage. Using scenario analysis for the source of heat generation used in kiln (force) drying wood, substituting wood fuel from coproducts for natural gas in a boiler for Milwaukee resulted in a substantial reduction in fossil-derived GW impact. Urban and traditional hardwood lumber production follow similar GW impact trajectories over their life-cycle stages with the lumber processing stage having the highest environmental impacts for both. Increasing the overall lumber yield and decreasing kiln (force) drying would substantially improve the environmental performance of urban hardwood lumber and help make it comparable to traditional lumber. |
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| Keywords: | Environmental impacts Greenhouse gases Lumber Supply chain Tree removal Urban forestry |
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