February 9, 2011
Challenges For Biofuels ““ New Life Cycle Assessment Report From Energy Biosciences Institute
A combination of rising costs, shrinking supplies, and concerns about global climate change are spurring the development of alternatives to the burning of fossil fuels to meet our transportation energy needs. Scientific studies have shown the most promising of possible alternatives to be liquid fuels derived from cellulosic biomass. These advanced new biofuels have the potential to be clean-burning, carbon-neutral and renewable. Some could also be delivered through existing pipelines and used in today's engines, replacing gasoline on a gallon-for-gallon basis with no loss of performance.
That is the promise of advanced biofuels and the focus to date has been on the technological challenges of producing high quality biofuels in a way that is both sustainable and economically competitive with gasoline. In addition to the technological challenges, however, there are also important social, economic and environmental challenges that must be addressed."These challenges include constraints imposed by economics and markets, resource limitations, health risks, climate forcing, nutrient cycle disruption, water demand, and land use," says Thomas McKone, an expert on health risk assessments who holds a joint appointment with the Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California (UC) at Berkeley. "Responding to these challenges effectively requires a life-cycle perspective."
McKone is the lead author of a report titled "Grand Challenges for Life-Cycle Assessment of Biofuels," which was funded by a grant from the Energy Biosciences Institute (EBI), a partnership between UC Berkeley, Berkeley Lab, the University of Illinois, and the BP energy corporation. This report summarizes seven grand challenges that "must be confronted" to enable life-cycle assessments that effectively evaluate the environmental footprint of biofuel alternatives.
Co-authoring this EBI report with McKone were William Nazaroff, Peter Berck, Maximilian Auffhammer, Tim Lipman, Margaret Torn, Eric Masanet, Agnes Lobscheid, Nicholas Santero, Umakant Mishra, Audrey Barrett, Matt Bomberg, Kevin Fingerman, Corinne Scown, Bret Strogen and Arpad Horvath. McKone and Horvath are the co-leaders of EBI's Life-Cycle Assessment Program.
A life-cycle assessment (LCA) is typically used to evaluate the potential impact of a product or activity on human health and the environment over the entire cradle-to-grave life cycle of that product or activity. In applying the LCA approach to advanced biofuels, McKone, Horvath and their co-authors identified the following seven grand challenges.
* Understanding farmers, feedstock options, and land use Biomass production for biofuels could displace existing products from land currently used for food, forage and fiber, which could increase the price of these goods in global markets. It could also induce deforestation that would exacerbate global climate change.
* Predicting biofuel production technologies and practices "“ Many options exist for biofuel production processes and final products. Much of the variability among LCA results for biofuels arises from lack of knowledge about how these different possible production and operation processes will evolve.
* Characterizing tailpipe emissions and their health consequences "“ Credible and reliable impact estimates for biofuel combustion are needed, but few studies of the health impacts from transportation fuel use have extended beyond air pollutants. Those that included an explicit metric for health damages emphasized mortality rather than morbidity and the overall disease burden.
* Incorporating spatial heterogeneity in inventories and assessments "“ The health consequences of pollutant emissions vary depending upon where the pollutant is released, with factors such as proximity to large populations looming large. Geographical variability also influences other factors, including soil carbon impacts and water demand consequences.
* Accounting for time i