The Park's interpretive rangers are encouraged to address environmental and Park issues in the daily free ranger programs. Visitors are introduced to a range of environmental issues which they may not have thought impinged on their lives, including pressure on natural resources, disruption of wildlife, and the speed of species extinction.
Major John Wesley Powell was a one armed civil war veteran who went on to become a director of the United States Geological Survey. He was also an inveterate adventurer and in 1869 he led the first successful European American river expedition down the Grand canyon. He was also a great naturalist and geologist.