@article{running_2012, 
  title={A Measurable Planetary Boundary for the Biosphere}, 
  volume={337}, 
  DOI={10.1126/science.1227620}, 
  number={6101}, 
  publisher={American Association for the Advancement of Science (AAAS)}, 
  author={Running}, 
  year={2012}, 
  month={Sep}
  }