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Threat: Melting glaciers. Glacier National Park is named after its glaciers, but most of them are expected to disappear by 2030 due to rising temperatures.
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Threat: Rising sea levels and saltwater intrusion. The Everglades is a wetland ecosystem that's highly sensitive to changes in water levels.
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Threat: Wildfires. These parks are home to the world's largest trees, the giant sequoias.
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Threat: Air pollution. Air pollution from coal-fired power plants and vehicle exhaust is harming the park's forests and reducing visibility.
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Threat: Water quality and quantity. Biscayne National Park protects a fragile ecosystem of coral reefs, mangrove forests, and seagrass beds.
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Threat: Invasive species. Invasive plants like cheatgrass are crowding out native plants and increasing the risk of wildfires.
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Threat: Permafrost thaw. Denali is home to North America's tallest mountain, Mount Denali.
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Threat: Sea level rise and hurricanes. Dry Tortugas National Park is a cluster of islands that are especially vulnerable to sea level rise and increasingly powerful hurricanes.
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Threat: Off-road vehicle use. Illegal off-road vehicle use damages vegetation and soils, and disrupts wildlife.
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Threat: Oil and gas development. While not a traditional National Park, Chaco Culture National Historical Park protects the ancestral Puebloan culture.
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