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 in impact assessments - Air emission
impacts from tailpipes and production facilities accrue within
years and can be allocated to the year of emissions without
discounting. GHG emission impacts are distributed over decades and
even centuries using integrated assessment models, and are often
discounted. Decisions about discounting can strongly influence the
outcome of impact assessments, yet there is not a clear rational
basis for making these decisions.
- Assessing transitions as well as end states - In addressing
transitions, emerging technologies could profoundly change the
assumptions that underlie biofuel LCAs. For example, changes in
protein production and consumption patterns or in urban land-use
policies could open up substantial agricultural land for biofuel
production, an action that would fundamentally change a biofuel
- Confronting uncertainty and variability - Addressing uncertainty is among the greatest of LCA challenges, not only for biofuels, but for other LCA efforts as well. To confront uncertainty and variability, the "doable" and "knowable" must be separated from assumptions that are conditional components of the LCA.
In their report, the authors of the EBI study say that confronting these seven grand challenges for a biofuels LCA requires a good balance between the needs of technology momentum and adaptive decision making, something, they say, that has not always been well-articulated among practitioners of LCA.
"We must recognize that LCA is not a product but an ongoing process for organizing information and prioritizing information needs," McKone says. "LCAs should be viewed as tools for building scenarios from which one can learn, rather than truth-generating-machines. We do not see the grand challenges outlined in this report as hurdles to be cleared, but rather as opportunities for the practitioner to focus attention on making LCA more useful to decision makers."