As the earth warms, sea levels rise and super-storms become more frequent and intense, many of the world’s major coastal cities may soon be under water. This series explores how four global cities are coming to grips with the real-time effects of rising seas and extreme weather.
[NARRATOR] The world's great cities face threats they have never before encountered.
"Very frightening moments unfolding in Eastern Japan."
[NARRATOR] The threats come from the sea...
"If you get six feet of sea-level rise, it would be a catastrophic flood."
[NARRATOR]...from above...
"Pounded with heavy rain for two days in a row."
[NARRATOR]...and from below...
"Nobody anticipated that much water coming in."
[NARRATOR] These are the problems and their solutions...
"We're looking at floating communities - essentially architecture on water."
[NARRATOR] For when the water comes.