Showing posts with label Life-Cycle Models. Show all posts
Showing posts with label Life-Cycle Models. Show all posts

Saturday, June 2, 2012

Impact of payments for carbon sequestered in wood products and avoided carbon emissions on the profitability of NIPF landowners in the US South

Abstract: This study determines economic impact of payments for carbon sequestered in wood products and avoided carbon emissions due to use of forest biomass for electricity generation instead of fossil fuels on the profitability of non-industrial private forest (NIPF) landowners in the US South. Penalties for carbon emitted at the time of undertaking various silvicultural activities and exponential decay of wood products were also considered. We used life-cycle assessment to evaluate carbon emissions from various silvicultural activities. We modified the traditional Faustmann forest rotation model to incorporate identified carbon payments and penalties. Slash pine (Pinus elliottii) was selected as a representative species. We found that the overall global warming impact (GWI) for managing a hectare of intensively managed slash pine plantation was 6539 kg carbon dioxide equivalent. The maximum land expectation value (LEV) for the scenario when all carbon payments and penalties along with payments for timber products were considered was $1299/ha using a 20 year rotation age. This value is about 71% higher than the LEV when only payments for timber products were taken into account ($760/ha using a 21 year rotation age). Our results clearly indicate that emerging carbon markets could greatly benefit southern NIPF landowners.

Highlights

► NIPF landowners in the US South supply majority of timber products at the national level.
► Payments for carbon sequestered in forest biomass, carbon stored in forest products, and avoided carbon emissions are important.
► These carbon payments can increase the profitability of southern NIPF landowners by 71% from base scenario.

by Puneet Dwivedia, Corresponding author contact information, E-mail the corresponding author, Robert Bailisa, Andrew Stainbackb and Douglas R. Carterc 
aSchool of Forestry & Environmental Studies, Yale University, Room # 125 Kroon Hall, 195 Prospect Street, New Haven, CT (06511), United States. Tel.: + 1 203 436 5362; fax: + 1 203 436 9158
b Department of Forestry, College of Agriculture, University of Kentucky, Lexington, KY, 40546, United States 
c School of Forest Resources and Conservation, University of Florida, Gainesville, FL, 32601, United States
Volume 78, June 2012, Pages 63–69
Keywords: Avoided carbon emissions; Carbon in wood products; Faustmann model; Life-cycle assessment; Optimal rotation age; Southern United States

Tuesday, August 9, 2011

The quantification of the embodied impacts of construction projects on energy, environment, and society based on I–O LCA

http://www.sciencedirect.com/science/article/pii/S030142151100557X
Abstract: With rapid social development and large-scale construction of infrastructure in China, construction projects have become one of the driving forces for the national economy, whose energy consumption, environmental emissions, and social impacts are significant. To completely understand the role of construction projects in Chinese society, this study developed input–output life-cycle assessment models based on 2002, 2005, and 2007 economic benchmarks. Inventory indicators included 10 types of energy, 7 kinds of environmental emissions, and 7 kinds of social impacts. Results show that embodied energy of construction projects in China accounts for 25–30% of total energy consumption; embodied SO2 emissions are being controlled, and the intensities of embodied NOx and CO2 have been reduced. However, given that the construction sector related employment is 17% of the total employment in China, the accidents and fatalities related to the construction sector are significant and represent approximately 50% of the national total. The embodied human and capital investments in science and technology (ST) increased from 2002 to 2007. The embodied full time equivalent (FTE) of each ST person also increased while the personal ST funding and intramural expenditures decreased. This might result from the time lag between RD activities and large-scale implementation.

by Yuan, Chang 1 , Robert J., Ries 1 , Yaowu, Wang 2
Energy Policy via Elsevier Science Direct www.ScienceDirect.com
In Press, Corrected Proof, Available online 6 August 2011
1. M.E. Rinker Sr. School of Building Construction, University of Florida, 331 Rinker Hall, Gainesville, FL 32611, USA
2. School of Management, Harbin Institute of Technology, Harbin 150001, PR China
Keywords: Input–output life cycle assessment; Embodied impacts; Construction projects