James Nachtwey is a war photographer. In what I can only imagine is a project connected to his TED prize from last year, he's planning to release a series of photographs on October 3 that are supposed to be the impetus for action in solving the problem that can be seen in these pictures.
More information (for instance, where you can see the photos-- you have to go to a major city; they won't available online, at least not immediately) is at the link below.
The problem and the subject are not specified. Shall we take bets?