Leave no trace

Leave No Trace, or LNT, is a set of ethics about keeping the outdoors clean. It started in the mid 1900's because of damage to the environment in the United States because of camping and related activities. In 1994, the not for profit Leave No Trace Center for Outdoor Ethics was formed to create educational resources around LNT and created seven principles of LNT. These are: 

 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 others

The idea is to leave the wilderness unchanged by people camping.
References

Category:Environmental organizations