The Burning Man event in Nevada's Black Rock City has a unique system for cleaning up after the event, known as the MOOP Map, which tracks and documents the debris left behind by participants. The map is used to identify areas that need more attention and to encourage participants to take responsibility for their impact on the environment. The event's organizers and participants work together to clean up the site, with a goal of leaving no trace behind. The MOOP Map has been in use for over 20 years and has shown a steady improvement in the community's ability to leave no trace.