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

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.
Damage to the playa
While fire is a primary component of many art exhibits and events, materials must be burned on a burn platform. At one time, burning was allowed to take place directly on the ground of the playa, but this practice allowed burn scars to form and was discontinued. On the last day, public shared burn areas are prepared for participants to use. While Burning Man does provide instructions on how to build a Burn Platform and what not to burn, there are concerns on whether some participants do not follow these instructions to the detriment of the environment and the participants.