<P> The Bureau of Land Management, which maintains the desert, has very strict requirements for the event . These stipulations include trash cleanup, removal of burn scars, dust abatement, and capture of fluid drippings from participant vehicles . For four weeks after the event has ended, the Black Rock City Department of Public Works (BRC--DPW) Playa Restoration Crew remains in the desert, cleaning up after the temporary city in an effort to make sure that no evidence of the event remains . </P> <P> Burning Man's carbon footprint is primarily from transportation to the remote area . The CoolingMan organization has estimated that the 2006 Burning Man was responsible for the generation of 27,000 tons of carbon dioxide, with 87% being from transportation to and from the remote location . The Sierra Club has criticized Burning Man for the "hundreds of thousands" of plastic water bottles that end up in landfills, as well as ostentatious displays of flames and explosions . </P> <P> Burning Man's 2007 theme, "Green Man", received criticism for the artwork Crude Awakening, a 99 - foot oil derrick that consumed 900 gallons of jet fuel and 2,000 gallons of liquid propane to blast a mushroom cloud 300 feet high into the sky . </P> <P> In an attempt to offset some of the event's carbon footprint, 30 - and 50 - kilowatt solar arrays were constructed in 2007 as permanent artifacts, providing an estimated annual carbon offset of 559 tons . The Burn Clean Project is a volunteer organization that has helped replace the use of fossil fuel with biodiesel . </P>

What is the meaning of the burning man festival