Since well before the debates about global warming and climate change, images have played an important part in bringing changes in nature and the environment to the attention of the general public. Moreover, most of these images have historic precursors. Gisela Parak illuminates how the synergy of photography and science gave rise to a class of photographs of environmental phenomena in the history of the United States of America, and how these images supported and instructed the scientific pursuit of knowledge, and were furthermore used as a persuasive means for directing public opinion.