"Changed the world"? Isn't that a bit too strong?
Really, people think that there are photographs that changed the world?
I, personally, don't agree, no matter how beautiful, telling, shocking or revealing the picture is...
Isn't it a little presumtuous of us to think that this art/profession can change anything? The world won't change because of us...We can tell the story, maybe, but to change the script...
Anything is possible.
Imagine a young man who has no ambition and no goals in his life that sees a particularly moving photo of people suffering in Africa. He decides that he can make a difference and decides to become a doctor to help these people.
He saves a young child from sickness who eventually grows up and becomes a bio-engineer who develops a means to grow limitless food and solves the world's hunger problem.
Because of this, some greedy CEO decides to assassinate this you man and steal the process for doing this.
The world is now smouldering in ashes because one corporation didn't like that another had the means to make limitless food and limitless money so they took it upon themselves to start a nuclear holocaust.
All of this because of one photo.