[1] A notable example are the powerful images of Carleton Watkins which were successfully used to stimulate the establishment of Yosemite National Park in 1864 and William Henry Jackson and Ansel Adams who advocated for expansion and continued funding of the park.
Renewed emphasis on photography-for-conservation arose at the beginning of the 21st century, primarily in response to the human-caused environmental crisis, recognizing that the global pattern of ecosystem degradation was not sustainable.
Determined effort can result in excellent photo stories that can move people's hearts and minds.
Though not every picture may find an immediate use, a carefully catalogued archive of conservation pictures can help increase impact of conservation related news stories, provide material for public awareness campaigns, including internet activism and sometimes serve as Investigative journalism evidence in court proceedings.
Images of habitat destruction, especially in protected areas, can be important as legal evidence against the activity.