Leave No Trace, sometimes written as LNT, is a set of ethics promoting conservation of the outdoors. Originating in the mid-20th century, the concept started as a movement in the United States in response to ecological damage caused by wilderness recreation. In 1994, the non-profit Leave No Trace Center for Outdoor Ethics was formed to create educational resources around LNT, and organized the framework of LNT into seven principles.Plan ahead and prepare Travel and camp on durable surfaces Dispose of waste properly Leave what you find Minimize campfire impacts Respect wildlife Be considerate of other visitors

NOLS is a non-profit outdoor education school based in the United States dedicated to teaching environmental ethics, technical outdoor skills, wilderness medicine, risk management and judgment, and leadership on extended wilderness expeditions and in traditional classrooms. It was previously known as the National Outdoor Leadership School, but in 2015, this label was retired in favor of the independent "NOLS". The "NOLS" mission is to be the leading source and teacher of wilderness skills and leadership that serve people and the environment. NOLS runs courses on six continents, with courses in a variety of wilderness environments and for almost any age group.