University of Arkansas researchers are using laser imaging to create a highly accurate, three-dimensional, digital map of public trails inside Carlsbad Cavern, the namesake cave of Carlsbad Caverns National Park, New Mexico.

While National Park Service air quality analysts don't think an oil refinery proposed near Theodore Roosevelt National Park would pose a problem under normal operating conditions, they are concerned that visibility could be impacted by "upset conditions" and want North Dakota officials to do additional review of the company's permit application.

Two national parks have been formally dedicated in Chile, marking a pledge made early last year to create five new national parks in the country while expanding the boundaries of three others.

Though he's probably fighting uphill, U.S. Rep. Raúl M. Grijalva wants members on the House Natural Resources Committee to sign off on a letter to Interior Secretary Ryan Zinke asking that he withdraw the land inside Bears Ears National Monument’s "traditional, lawful boundaries from new oil, gas and mining claims."