EVERGLADES NATONAL PARK, UNITED STATES
White House staff members walk through a landing zone as Obama arrives via Marine One helicopter at Everglades...
White House staff members walk through a landing zone as U.S. President Barack Obama arrives via Marine One helicopter at Everglades National Park, Florida April 22, 2015. Obama is visiting the subtropical swamps of the park on Wednesday, part of a push to get Americans thinking and talking about the damage climate change is causing close to home. REUTERS/Jonathan Ernst