<P> In the mid 20th - century there was a cultural shift in wilderness ethics from woodcraft where wilderness travelers prided themselves on their ability to rely on the resources of wild lands to a post-WWII ethics of minimal impact on the environment . Leave No Trace began in the 1960s and 1970s . There was a large increase of wilderness visitation following the creation of new recreational equipment such as white gas stoves , synthetic tents , and sleeping pads . This began a commercial interest in outdoor recreation which in turn caused more visitors to national parks . In those decades , the United States Forest Service , the Bureau of Land Management , and the National Park Service started to teach their non-motorized visitors how to have a minimal impact on the land . Wilderness Informational Specialists were trained to educate visitors on minimal impact camping in the different parks . In 1987 the three departments cooperatively developed a pamphlet titled `` Leave No Trace Land Ethics '' . </P>
<P> In the mid 20th - century there was a cultural shift in wilderness ethics from woodcraft where wilderness travelers prided themselves on their ability to rely on the resources of wild lands to a post-WWII ethics of minimal impact on the environment . Leave No Trace began in the 1960s and 1970s . There was a large increase of wilderness visitation following the creation of new recreational equipment such as white gas stoves , synthetic tents , and sleeping pads . This began a commercial interest in outdoor recreation which in turn caused more visitors to national parks . In those decades , the United States Forest Service , the Bureau of Land Management , and the National Park Service started to teach their non-motorized visitors how to have a minimal impact on the land . Wilderness Informational Specialists were trained to educate visitors on minimal impact camping in the different parks . In 1987 the three departments cooperatively developed a pamphlet titled `` Leave No Trace Land Ethics '' . </P>
when was the term leave no trace created
when was the term leave no trace created
in the 1960s and 1970s
in the 1960s and 1970s