Can Bioenergy from Forest Products Significantly and Sustainably Reduce Fossil Fuel Use?
Schulze, E.-D., Korner, C., Law, B.E., Haberl, H. and Luyssaert, S. 2012. Large-scale bioenergy from additional harvest of forest biomass is neither sustainable nor greenhouse gas neutral. Global Change Biology Bioenergy: 10.1111/j.1757-1707.2012.01169.x.
First of all, the five scientists - hailing from Austria, France, Germany, Switzerland and the United States - argue that "such an increase in biomass harvest would result in younger forests, lower biomass pools, depleted soil nutrient stocks and a loss of other ecosystem functions," such that "the proposed strategy is likely to miss its main objective, i.e. to reduce GHG emissions, because it would result in a reduction of biomass pools that may take decades to centuries to be paid back by fossil fuel substitution, if paid back at all." In the long run, therefore, they feel that "depleted soil fertility will make the production unsustainable and require fertilization, which in turn increases GHG emissions due to N2O emissions," which ultimately makes the large-scale production of bioenergy from forest biomass, in their opinion, "neither sustainable nor GHG neutral."
A reasonable alternative, in Schulze et al.'s opinion, would be the "afforestation of lands that once carried forests," which they say would allow existing forests to continue to provide a range of ecosystem services. Yet, "on arable or pasture land," as they continue, "such a strategy would compete with food and fodder production." And, hence, they caution that society should fully quantify direct and indirect GHG emissions associated with energy alternatives and associated consequences prior to making policy commitments that have long-term effects on global forests; for they ominously warn "there is a substantial risk of sacrificing forest integrity and sustainability for maintaining or even increasing energy production with no guarantee to mitigate climate change." Put another way, it is extremely important that we do not get the regulatory cart before the scientific horse.