@article{2006the,
  title = {The Energetic Metabolism of the European Union and the United States: Decadal Energy Input Time-Series with an Emphasis on Biomass}
  author = { Helmut Haberl},
  journal = {Journal of Industrial Ecology},
  doi = {10.1162/jiec.2006.10.4.151},
  year = {2006}
}