http://thinkprogress.org/climate/2016/05/30/3782869/national-parks-world-heritage-climate-change/
"With spring now in full gear throughout most of the United States, it’s a good bet that Memorial Day Weekend will again be the busiest of the whole year at many national parks, including the Great Smoky Mountains, Yellowstone, the Grand Canyon, and Utah’s Mount Zion. Last year, 305 million people visited National Park Service-administered sites, signifying the parks’ appeal to millions of Americans and world tourists. They’d better hurry. A report released Thursday from the United Nations and the Union of Concerned Scientists found that the threats posed by climate change particularly endanger the unique and fragile places on the planet: World Heritage Sites."
