FILE - In this Saturday, June 18, 2016, file photo, President Barack Obama speaks by the Sentinel Bridge in the Yosemite Valley, in front of Yosemite Falls, the highest waterfall in the park, at ... more 
FILE - In this Saturday, June 18, 2016, file photo, President Barack Obama speaks by the Sentinel Bridge in the Yosemite Valley, in front of Yosemite Falls, the highest waterfall in the park, at Yosemite National Park, Calif. In a new project with National Geographic, Obama becomes the first sitting U.S. president to project himself into virtual reality, in this case, a 360-degree representation of Yosemite National Park. The 11-minute VR video, narrated by Obama, is one part paean to the wonders of America’s national parks and one part warning of the threat posed by climate change. (AP Photo/Jacquelyn Martin, File) less 
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Associated Press | Photo By Jacquelyn Martin, File
Thu, Aug 25, 2016 10:12 AM EDT