FILE - In this Jan. 22, 2017, file photo, the sun rises over the clouds in front of the summit of Haleakala volcano in Haleakala National Park on Hawaii's island of Maui. The National Park Service is studying whether to keep its new system requiring reservations to drive up to Haleakala's summit to see the sunrise. The agency said Thursday, June 15 it will conduct an environmental assessment for the program, which was implemented on an emergency basis earlier this year to address overcrowding. (AP Photo/Caleb Jones, File)
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