@misc{indiciae7fda8acd0b66,
  title = {Human impact on the planet: an earth system science perspective and ethical considerations},
  author = {Richard S. Williams},
  year = {2002},
  doi = {10.3133/ofr02349},
  url = {https://pubs.usgs.gov/publication/ofr02349},
  note = {Source identifier: ofr02349}
}