Impacts of climate change on the National Park System are such that it is "no longer ecologically viable to manage resources solely within park boundaries," according to a study that found parks "are overwhelmingly at the extreme warm end of historical temperature distributions..."

Treasures of history, culture, and natural beauty contained within the National Park System are increasingly at risk to the perils of climate change, with flooding and wildfire likely to sweep numerous park sites across the country, according to the Union of Concerned Scientists.

Summer arrives today at Everglades National Park, where the park staff has transitioned its operations to the summer hours.

Rivers run fast and tumbling throughout the National Park System, there are streams with lazy meanders, and placid lakes perfect for dipping a paddle. This diversity poses a delightful dilemma when you have the urge to float and paddle. What follows is just a sampling of the experiences that await you, whether you have hundreds of watery miles under your paddle, or are looking for calm waters to take your youngsters.