The Society of American Foresters (SAF) has published “Forest Carbon Accounting Considerations in US Bioenergy Policy” in the Journal of Forestry. The article, which was authored by an SAF-sponsored team comprised of some of the US’s leading forest carbon experts (including FPL Research Forester Ken Skog), identifies and examines scientific-based insights essential to understanding forest bioenergy and “carbon debts.”
As noted by Reid Miner, the lead author and chair of the SAF team, the article’s insights, which are built on a comprehensive review of the most current literature, illustrate why quantifying the full spectrum of forest-based activities is critical when accounting for biogenic carbon and carbon dioxide, and why policymakers should consider that:
– Even while the greenhouse-gas benefits of sustainable forest biomass energy are sometimes delayed, it is well established that these benefits are substantial over the long term.
– The Intergovernmental Panel on Climate Change has reported that peak global temperature is likely to be determined by long-term cumulative CO2 emissions, and that forest-based energy and products help limit cumulative CO2 emissions.
– An accurate comparison of the carbon impacts of forest biomass energy with those of other energy sources requires the use of consistent timeframes in the comparison.
– Landowner responses to increased wood demand can have a significant influence on the carbon impacts of forest biomass energy.
The release of this article comes as a number of groups await the Environmental Protection Agency’s Carbon Accounting Framework for Biogenic Carbon Emissions, following a three-year deferral to examine the issue. Dr. Roger Sedjo, a member of both the SAF team and Environmental Protection Agency (EPA) Science Advisory Board (SAB) said, “I was concerned about the complexity of the SAB recommendations that resulted from our discussions, and was also uncertain whether the SAB process captured the importance of market dynamics, including the effects of markets on forest investment levels. The magnitude and timing of benefits from use of forest bioenergy depends upon availability of markets for wood products. This article clearly shows how influential markets are as we consider how forest biomass factors into our energy future.” Sedjo also noted that timing of carbon benefits is often misrepresented in current literature—something that is also addressed in this article.
University of Washington scientist Dr. Elaine Oneil added, “In the West, reducing forest biomass density is an effective means of stemming the threat of large-scale intensive wildfires. Generally, the non-merchantable residues from thinning projects are burned on site to reduce fire risk and improve forest health. Utilizing residues to produce biomass energy, instead of burning them in the forest, returns carbon to the atmosphere at the same time as burning residues on site without energy recovery, so the net impact of energy production on biogenic carbon emissions is essentially zero and the benefits from using residues for energy are immediate. However, these benefits are not possible without markets for these residues.”
North Carolina State Professor Dr. Robert Abt was impressed by the SAF team’s work, which represents different disciplines and regions of the country. “The study provides a comprehensive review of the science surrounding wood bioenergy and carbon emissions. Unlike many discussions, it recognizes the economic relationships among wood bioenergy uses, forest harvests, and forest investments by providing a review of both the theoretical rationale and the empirical evidence of the effect of an increase in wood demand on forest carbon. The literature demonstrates that increased demand for wood bioenergy can lead not only to increased harvests, but also to increased forest investments, which provide offsetting forest growth and associated offsetting increases in forest carbon.”