@article{wiedmann2015the,
  title = {The material footprint of nations}
  author = {Wiedmann, Thomas O. and Schandl, Heinz and Lenzen, Manfred and Moran, Daniel and Suh, Sangwon and West, James and Kanemoto, Keiichiro},
  journal = {Proceedings of the National Academy of Sciences},
  url = {http://www.pnas.org/lookup/doi/10.1073/pnas.1220362110},
  doi = {10.1073/pnas.1220362110},
  year = {2015}
}