From an excellent series of articles in the New York Times Magazine:
"Much of Singapore lies less than 50 feet above sea level. A third of the island sits around 16 feet above the water — low enough to give planners the jitters. Coastal roads are being raised; a new airport terminal is being built 18 feet above sea level. All the while, the island receives more and more rain each year. “If global temperatures continue to rise,” a government official said last year, “many parts of Singapore could eventually be submerged.”"