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U.S. President Barack Obama speaks while celebrating the 100th anniversary of the US National Parks system at Yosemite National Park, California, on June 18, 2016. / AFP / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
U.S. President Barack Obama speaks while celebrating the 100th anniversary of the US National Parks system at Yosemite National Park, California, on June 18, 2016. / AFP / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

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    The Obamas tour Yosemite National Park

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The Obamas tour Yosemite National Park

President Barack Obama spoke at Yosemite National Park about the importance of America's parks, but cautioned the threat of climate change.

The Obamas tour Yosemite National Park

President Barack Obama spoke at Yosemite National Park about the importance of America's parks, but cautioned the threat of climate change.