This aerial photo shows Indiana Dunes National Park and Lake Michigan near Porter, Indiana, on November 2, 2023. US Biologist Laura Brennan describes the coin-sized Karner blue butterfly as "very delicate and graceful" with a "lovely blue" coloring and "just a little speckling of orange." The species, declared endangered in 1992, used to flourish in Indiana Dunes National Park, where Brennan has worked for two decades. Brennan and thousands of others in the National Park Service (NPS) are witnessing firsthand the consequences of the climate crisis and struggling to mitigate its impacts. (Photo by Diane DESOBEAU / AFP)