While there's concern that one day Joshua trees might no longer grow in Joshua Tree National Park, or that Glacier National Park might lose its rivers of ice, what about Saguaro National Park and its iconic cacti? Kurt Repanshek travels to Saguaro National Park to discuss the decadal survey of saguaros with park biologist Don Swann. Erika Zambello heads to coastal Georgia for an off-season visit to Cumberland Island National Seashore.
