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Empirical evidence for the potential climate benefits of decarbonizing light vehicle transport in the U.S. with bioenergy from purpose-grown biomass with and without BECCS

Citation

Gelfand, Ilya et al. (2020), Empirical evidence for the potential climate benefits of decarbonizing light vehicle transport in the U.S. with bioenergy from purpose-grown biomass with and without BECCS, Dryad, Dataset, https://doi.org/10.5061/dryad.44j0zpc8r

Abstract

Climate mitigation scenarios limiting global temperature increases to 1.5 °C rely on decarbonizing vehicle transport with bioenergy production plus carbon capture and storage (BECCS), but climate impacts for producing different bioenergy feedstocks have not been directly compared experimentally nor for ethanol vs. electric light-duty vehicles. A field experiment at two Midwest U.S. sites on contrasting soils revealed that feedstock yields of seven potential bioenergy cropping systems varied substantially within sites but little between. Bioenergy produced per hectare reflected yields: miscanthus > poplar > switchgrass > native grasses ≈ maize stover (residue) > restored prairie ≈ early successional. Greenhouse gas emission intensities for ethanol vehicles ranged from 20 to -179 g CO2e MJ-1: maize stover >> miscanthus ≈ switchgrass ≈ native grasses ≈ poplar > early successional ≥ restored prairie; direct climate benefits ranged from ~80% (stover) – 290% (restored prairie) reductions in CO2e compared to petroleum, and were similar for electric vehicles. With CCS, reductions in emission intensities ranged from 204% (stover) – 416% (restored prairie) for ethanol vehicles, and from 329 – 558% for electric vehicles, declining 27% and 15%, respectively, once soil carbon equilibrates within several decades of establishment.  Extrapolation based on expected U.S. transportation energy use suggests that, once CCS potential is maximized with CO2 pipeline infrastructure, negative emissions from bioenergy with CCS for light-duty electric vehicles could capture >900 Tg CO2e yr-1 in the U.S. In the future, as other renewable electricity sources become more important, electricity production from biomass would offset less fossil-fuel electricity, and the advantage of electric over ethanol vehicles would decrease proportionately.

Methods

Data collected as described in materials and methods.

Usage Notes

See the readme file for a description of data in "dataset_gelfand_es&t.xlsx". The file "calculations_gelfand_es&t.xlsx" shows the assumptions, calculations, and extrapolations of these data and their location in the paper and supplemental information.

Funding

U.S. Department of Energy, Award: DE-FC02-07ER64494

U.S. Department of Energy, Award: DE-SC0018409

U.S. Department of Energy, Award: DE-AC05-76RL01830

National Science Foundation, Award: DEB 1832042

AgBioResearch, Michigan State University