" The parks are our indicator species. Living laboratories where we can see—sometimes in something as simple as a photograph—that trouble is coming. If glaciers continue to melt at their current rate, then one day soon entire Alaskan villages will be underwater. People are already dying from wildfires caused, in part, by the longer, hotter summers brought on by climate change. "

― Conor Knighton , Leave Only Footprints: My Acadia-to-Zion Journey Through Every National Park