Burning Man 2011, Black Rock Desert, Nevada, United States

Concerns regarding the "Leave No Trace" policy
Burning Man takes place in the middle of a large playa and while not inhabited by humans itself, the area around the playa is home to many animals and plants.
Supporters of Burning Man point out that participants are encouraged to leave no trace (LNT) of their visit to Black Rock City (BRC) and not to contaminate the area with litter, commonly known as MOOP (Matter Out Of Place). Despite the BLM and LLC's insistence on the practice of LNT, the amount of residual trash at the site has increased over the years.