Studies released by the NPS regarding Yellowstone. Already changes in Yosemite and plans in the works for some Canyonland parks, such as entry reservation system's and limits on visitor numbers, and other high visitation parks. Get there while the getting's good.
https://www.nps.gov/yell/learn/news/17042.htm
https://www.nps.gov/yell/learn/news/17042.htm
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