Since 2007, Carl de Keyzer has been traveling around Europe's various coastlines, shooting pictures of decaying fortifications along the shore. The crumbling walls and ruined bunkers offer a telling symbol for mankind's response to global warming.
The photos are collected in a new book, Moments Before The Flood, which takes an abstract yet powerful look at the threat of flooding caused by climate change.
"Once it happens, not one system is going to stop it," de Keyzer told Time about the potential results of global warming. "How high can you build the walls, how much money can you spend on it?"